Is Cyndi Lauper actually shown in the track info, or does it still say Ray Charles is playing, but you hear Cyndi Lauper? If it's the latter, then I am almost certain you have some corrupt MP3's. This happened once when I lost power while my music drives were mounted RW, and I had to do a fsck. After the fsck, random bits of songs were strewn about my MP3 collection. I'd say it affected 30 or 40 songs in the same manner you speak of -- random bits of a song will appear in other songs.

If it's the former, then, uh, that would be interesting...