Classical compositions used in prog, or which might have inspired to a specific track

[A. Scherze]

I think it's more likely that Keith would have listened to György, rather than the other way around, ie it's Keith's music that sounds like György. I don't know how common recordings of Ligeti's piano music (which is basically what we're talking about here) was in the late 60's or early 70's, but we know Keith was listening to 20th century composers like Ginastera, Copland, and Rodrigo, so it's feasible that he would have heard Ligeti if such opportunity had been afforded to him.

Anyone who has seen 2001: A Space Odyssey has heard Ligeti: Requiem for Soprano, Mezzo-Soprano, 2 Mixed Choirs and Orchestra; Lux Aeterna; Atmosphères.