Which bands do you try to have absolutely everything they have produced?

I’m talking EPs, solo albums, bootlegs, live albums, etc.

For me, I have pretty much complete collections of Jethro Tull, Ayreon (including Arjen’s solo work, Stream of Passion, Gentle Storm, etc), Led Zeppelin, Zoltan Koksic’s Bartok piano, Steeleye Span, Tool, Plini, and, of course, my avatar Caravan.