In reply to jackappleby: I'm surprised no-one has mentioned some of the obvious choices from classical music:
Richard Strauss - An Alpine Symphony (a day out climbing in the Alps depicting sunrise, meadows, glaciers, storms, etc)
Mahler - the colossal 1st movement of his 3rd Symphony (working title: "What the mountain crags tell me")
Delius - A Song of the High Hills
On the pop music front the slab climber's choice Slip Slidin' Away actually has a climb named after it (Baggy, I think),