SEC Form 3, Form 4 and Form 5 and Application for EDGAR Access
 (Form ID) Confirmation of Authority to Sign

Pursuant to Instruction 7 to SEC "Form 3 - Initial Statement of
Beneficial Ownership of Security," "Form 4--Statement of Changes
in Beneficial Ownership" and "Form 5 - Annual Statement of
Beneficial Ownership of Securities" the undersigned, being a
Trustee of MassMutual Corporate Investors and MassMutual
Participation Investors (each, a "Trust"), hereby appoint and
designate Sara Stinson, Mark Godin, Melissa Busso, Ruth Howe,
Ann Malloy and Melissa LaGrant and each of them singly,
my true and lawful power of attorney with full power to
(a) apply for access to the EDGAR filing system in my name and
(b) sign for me and file with the Securities and Exchange
Commission, the New York Stock Exchange and the Trust said
SEC Forms 3 4 and/or 5 with respect to shares of the Trust
purchased or sold by the undersigned or any other change
of beneficial ownership relating to equity or derivative
securities of the Trust required to be reported by the
undersigned.

This authorization shall remain in effect until a written
revocation is executed by the undersigned and filed with the
Securities and Exchange
Commission.



Signature and Date:                        October 18, 2007
                 ------------------------------------------

Name:    Roger W. Crandall
Title:   Chairman and Trustee of MassMutual Corporate Investors
          and MassMutual Participation Investors