Keith Jarrett - The Koln Concert - 2 LPs

Keith Jarrett
The Koln Concert
ECM 1064/65 - 2 LP 180g import 

The Köln Concert is a concert recording of solo piano improvisations performed by Keith Jarrett at the Opera House in Cologne (German: Köln) on January 24, 1975. The double-vinyl album was originally released in 1975 by ECM. It is the best selling solo piano album in history - in ALL genres! Not exactly jazz, not exactly classical, this is an album for piano lovers, music lovers, and anyone appreciating the creative process. 
As there are no discernible themes, no quotes, no through lines, the 4 sides are simply titled; 

Part I
Part IIa
Part IIb
Part IIC