For any project I'm seriously working on, I'll create a custom station on Pandora that evokes the moods and themes that I'm looking to capture in the game. For my current epistolary RPG playtest, I'm playing the ghost of an old blues musician who sold his soul o the devil, so the channel is formed from "Me and the Devil Blues" and "Hellhound on my Trail" by Robert Johnson. When writing for my game about lonely dinosaur people, it was a combination of Koyanisqaatsi by Phillip Glass and the soundtrack to The Dark Crystal. When making a game about substitute Grim Reapers, it's all old bluegrass spirituals, French-Canadian folk songs and upbeat songs about depressing topics ("When Will You Die" by They Might Be Giants, "More Bad Times" by the Presidents of the United States of America, etc.)