Organization and Summary of Significant Accounting Policies	3 Months Ended
Mar. 31, 2014
Accounting Policies [Abstract]
Organization and Summary of Significant Accounting Policies	NOTE 1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Organization and Background Mills Music Trust (the “Trust”) was created by a Declaration of Trust, dated December 3, 1964 (the “Declaration of Trust”), for the purpose of acquiring from Mills Music, Inc. (“Old Mills”), the rights to receive payment of a deferred contingent purchase price obligation (the “Contingent Portion”) payable to Old Mills. The obligation to pay the Contingent Portion arose as the result of the sale by Old Mills of its music and lyric copyright catalogue (the “Catalogue”) to a newly formed company pursuant to an asset purchase agreement dated December 5, 1964 (the “Asset Purchase Agreement”). The Contingent Portion amounts are currently payable by EMI Mills Music Inc. (“EMI”), the owner and administrative entity for the copyrighted materials. Pursuant to the Asset Purchase Agreement, payment of the Contingent Portion to the Trust continues until the end of the year in which the last copyright in the Catalogue expires and cannot be renewed. HSBC Bank, USA, N.A. is the Corporate Trustee of the Trust (the “Corporate Trustee”), and Lee Eastman and Michael E. Reiss are the Individual Trustees of the Trust (the “Individual Trustees” and together with the Corporate Trustee, the “Trustees”). Proceeds from Contingent Portion Payments The Trust receives quarterly payments of the Contingent Portion from EMI and distributes the amounts it receives to the registered owners of Trust Certificates (the “Unit Holders”) representing interests in the Trust (the “Trust Units”), after payment of, or withholdings in connection with, expenses and liabilities of the Trust. The Declaration of Trust provides that these are the Trust’s sole responsibilities and that the Trust is prohibited from engaging in any business activities. Payments that EMI makes of the Contingent Portion to the Trust are based on royalty income which the Catalogue generates and EMI collects. The Trust does not own the Catalogue or any copyrights or other intellectual property rights and is not responsible for collecting royalties in connection with the Catalogue. As the current owner and administrator of the Catalogue, EMI is obligated under the Asset Purchase Agreement to use its best efforts to collect all royalties, domestic and foreign, in connection with the Catalogue and to remit a portion of its royalty income to the Trust as its Contingent Portion payment obligation, in accordance with the terms of the Asset Purchase Agreement. The amount of each payment of the Contingent Portion is based on a formula set forth in the Asset Purchase Agreement. For information regarding the calculation of the Contingent Portion and a related dispute between EMI and the Trust see “Contingent Portion Payments” under Part I—Item 2, “Management’s Discussion and Analysis of Financial Condition and Results of Operations”. Cash Distributions to Unit Holders The Declaration of Trust provides for the distribution to the Unit Holders of all funds the Trust receives after payment of, or withholdings in connection with, expenses and liabilities of the Trust. The Copyright Catalogue The Catalogue is estimated to be composed of over 25,000 music titles (the “Copyrighted Songs”), of which approximately 1,600 produced royalty income in recent years. EMI has provided the Trust with a listing of the top 50 earning songs in the Catalogue during the 2013 calendar year (the “Top 50 Songs”), together with certain copyright information with respect to each of the Top 50 Songs (the “2013 Listing”). A copy of the 2013 Listing, as provided by EMI, is included in the Trust’s annual report on Form 10-K for the fiscal year ended December 31, 2013. The 2013 Listing does not include any information regarding Copyrighted Songs for the 2014 calendar year. Accounting Policies Payments from EMI to the Trust of the Contingent Portion are typically made in March, June, September and December for the prior calendar quarter. The payments received are accounted for on a cash basis, as are expenses of the Trust. The Declaration of Trust provides for the distribution of the amounts it receives in Contingent Portion payments from EMI to the Unit Holders after payment of, or withholdings in connection with, expenses and liabilities of the Trust. The Trust’s financial statements reflect only cash transactions and do not include transactions that would be recorded in financial statements presented on the accrual basis of accounting, as contemplated by generally accepted accounting principles in the United States. The Trust does not prepare a balance sheet or a statement of cash flows.

NOTE 1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Organization and Background

Mills Music Trust (the “Trust”) was created by a Declaration of Trust, dated December 3, 1964 (the “Declaration of Trust”), for the purpose of acquiring from Mills Music, Inc. (“Old Mills”), the rights to receive payment of a deferred contingent purchase price obligation (the “Contingent Portion”) payable to Old Mills. The obligation to pay the Contingent Portion arose as the result of the sale by Old Mills of its music and lyric copyright catalogue (the “Catalogue”) to a newly formed company pursuant to an asset purchase agreement dated December 5, 1964 (the “Asset Purchase Agreement”). The Contingent Portion amounts are currently payable by EMI Mills Music Inc. (“EMI”), the owner and administrative entity for the copyrighted materials. Pursuant to the Asset Purchase Agreement, payment of the Contingent Portion to the Trust continues until the end of the year in which the last copyright in the Catalogue expires and cannot be renewed.

HSBC Bank, USA, N.A. is the Corporate Trustee of the Trust (the “Corporate Trustee”), and Lee Eastman and Michael E. Reiss are the Individual Trustees of the Trust (the “Individual Trustees” and together with the Corporate Trustee, the “Trustees”).

Proceeds from Contingent Portion Payments

The Trust receives quarterly payments of the Contingent Portion from EMI and distributes the amounts it receives to the registered owners of Trust Certificates (the “Unit Holders”) representing interests in the Trust (the “Trust Units”), after payment of, or withholdings in connection with, expenses and liabilities of the Trust. The Declaration of Trust provides that these are the Trust’s sole responsibilities and that the Trust is prohibited from engaging in any business activities.

Payments that EMI makes of the Contingent Portion to the Trust are based on royalty income which the Catalogue generates and EMI collects. The Trust does not own the Catalogue or any copyrights or other intellectual property rights and is not responsible for collecting royalties in connection with the Catalogue. As the current owner and administrator of the Catalogue, EMI is obligated under the Asset Purchase Agreement to use its best efforts to collect all royalties, domestic and foreign, in connection with the Catalogue and to remit a portion of its royalty income to the Trust as its Contingent Portion payment obligation, in accordance with the terms of the Asset Purchase Agreement.

The amount of each payment of the Contingent Portion is based on a formula set forth in the Asset Purchase Agreement. For information regarding the calculation of the Contingent Portion and a related dispute between EMI and the Trust see “Contingent Portion Payments” under Part I—Item 2, “Management’s Discussion and Analysis of Financial Condition and Results of Operations”.

Cash Distributions to Unit Holders

The Declaration of Trust provides for the distribution to the Unit Holders of all funds the Trust receives after payment of, or withholdings in connection with, expenses and liabilities of the Trust.

The Copyright Catalogue

The Catalogue is estimated to be composed of over 25,000 music titles (the “Copyrighted Songs”), of which approximately 1,600 produced royalty income in recent years. EMI has provided the Trust with a listing of the top 50 earning songs in the Catalogue during the 2013 calendar year (the “Top 50 Songs”), together with certain copyright information with respect to each of the Top 50 Songs (the “2013 Listing”). A copy of the 2013 Listing, as provided by EMI, is included in the Trust’s annual report on Form 10-K for the fiscal year ended December 31, 2013. The 2013 Listing does not include any information regarding Copyrighted Songs for the 2014 calendar year.

Accounting Policies

Payments from EMI to the Trust of the Contingent Portion are typically made in March, June, September and December for the prior calendar quarter. The payments received are accounted for on a cash basis, as are expenses of the Trust. The Declaration of Trust provides for the distribution of the amounts it receives in Contingent Portion payments from EMI to the Unit Holders after payment of, or withholdings in connection with, expenses and liabilities of the Trust.

The Trust’s financial statements reflect only cash transactions and do not include transactions that would be recorded in financial statements presented on the accrual basis of accounting, as contemplated by generally accepted accounting principles in the United States. The Trust does not prepare a balance sheet or a statement of cash flows.