There is a special 'Box Set of CD's out there titled 'Yes Years' that is one of the better compilation box sets out there. A lot of them (boxed sets) cost way to much for what little you get and very few ever have all the music or, at the very least, all top quality songs from the band's career. The best I know of is the Led Zeppelin box set which has every single album and all songs except for the double-live album along with extras and a good bio. The Pink Floyd box set, on the other hand, costs WAY to much, is missing a LOT of albums and songs, and has a mediocre bio included. The Yes Years box set has one of the very best bio's I've seen along with a 4 DC set of some of their very best music. While not every single song is covered, all that are covered are generally considered their very best stuff. And the price is decent as well.