Now I can't wait for the moonshot song :D
I was thinking about that song after listening to Courtesy Call, i can't wait either :D
Several songs on the OST used the songs from the game files, but at different volumes, some parts were made specifically for the OST, but the majority of the songs are made using the songs you find in the game files, that makes me think, can you make your own Portal 2 music by using those and a program like Audacity?