Phyco iPod/iTunes

The other day I was on a long car ride home listening to my iPod mini when I noticed that the song I was listening to clearly had the wrong band underneath it. I thought it was just some annoying little fluke, but low and behold the next day several other songs had the same condition. About 20 minuets ago I was listening to some u2(Where the streets have no name) when I looked down and saw that it was titled I still havent found what I am looking for! A travesty indeed. After examining my music library I found that this had append to about 30-40 out of 700 songs. All of the music was ripped directly from a CD. Any thoughts as to why this may be?