I can't understand it but it doesn't seem to matter if I bought the cd from iTunes or not, it separates the different artists in a cd as separate cds. Which makes it maddening to try and find specific things in one cd. Why does it do this? Is there a way to change this?
I've also had that problem at times, when ripping CDs. I typically see this when some (or all) of the songs on the CD are credited to different artists.
Sometimes that's considered a compilation CD, where there really isn't a single artist that produced the CD, but rather a variety -- like for a movie soundtrack. You can check the "Compilation" tag in iTunes and it will group the songs together for the single album.
For other CDs from a single artist, but where more than one artist is credited -- like for a duet or such -- you just have to use the "Album Artist" field in iTunes. That tells iTunes that a single artist is credit for the album, even though multiple artists actually sang some of the songs. This will group all the songs together for the single album, with each song being credited to the artist(s) who were involved.
I hope that made sense.
Mark