To start?
Desert, island, mountain cave... If I'd stay with "modern" music, and as long as I could have my system, these would be three to start "The 100 Collection":
Pink Floyd: Meddle
Can: Soon Over Babaluma
Wether Report: Black Market
Building a 100 album vinyl collection 3 must have albums are?
No opera or rap in the three must haves. Sorry.