Too hard to choose one but if pushed...
All of John Martyn's 'Solid Air' album, particularly the title track. It is a masterpiece, he died recently which really upset me.
( Anthropos Was making beer on, Thu 14 May 2009, 11:47, archived)

Martyn and Solid Air FTW!
As well as Thompson
( Throat And Ice Pie I see dem tatties dere., Thu 14 May 2009, 11:59, archived)