Seems the code needed to reverse the names exists. Nevertheless the following songs were not matched to entries in the Top 100 database:
What's Going On - Gaye, Marvin
My Cherie Amour - Wonder, Stevie
My Guy - Wells, Mary
Ben - Jackson, Michael
25 Miles - Starr, Edwin
Superfreak - James, Rick
Don't Leave Me This Way - Houston, Thelma
Walk Away From Love - Ruffin, David
I Heard it Through the Grapevine - Gaye, Marvin
just to name a few, meanwhile, valid matches were made with
I Want You Back - Jackson 5
Reach Out I'll Be There - Four Tops
Please Mr. Postman - Marvelettes
Easy - Commodores
Somebody's Watching Me - Rockwell
Can you verify this by (if necessary) reversing the artist name of a song by a solo artist known to be in the Top 100 database then adding it to the playing now list and running CF? The only thing common to all songs that were not matched in all my attempts is the existence of a reversed artist name for each and every unmatched song.