Hate to even start this, partly because you never know the extent to which solos are really improvised:
All of Kind of Blue and
Coltrane, "I'll Wait and Pray" and "Naima"
All of the Garcia stuff on the European tour album
Joe Pass--the first Virtuoso album (as if I could actually play like that...)
This is a question that sends me back to all of my albums and makes me want to think about every solo I've ever played. A great question for a workshop: what solos have most influenced us and how?