To commemorate the 40th anniversary of the "Japan Association of Music Enterprises" (consisting of 94 companies), a CD will be released called "Music Saves the Earth", which will be a compilation of 42 songs which are based on the artist's first song, including Ayu's "A Song for XX". This will be a charity-type CD, in which the funds will be going to the people of Iraq. From what I could gather, I think the songs won't be performed by the original artists (instead, by people like Eriko Imai and Hitomi Shimatani), as shown below:
Sanspo
Yomiuri