https://www.youtube.com/watch?v=r6FVk2k4qsM&list=OLAK5uy_nPFKgNe4xhK0kOJF2pBecddnc1NkNndZA

I have used this double album since early/mid 1990s when I need to get "in the zone" for productive programming. Never let me down. Haven't found any other music so good at it (for me).