Maybe this is already possible and I haven't figured out how yet...

I'm in the process of ripping and uploading 6 CDs worth of Shostakovich string quartets. I would like to put them all in a playlist and be able to play a random piece when the mood strikes me. However, right now I will get a random movement, since each piece is a number of tracks long. I'd rather not jump into the middle of a piece.

Can I do this with sub-playlists now?