The Doom series (Ultimate Doom in particular...) is my all-time favourite game series. Everything about it is amazing. Plus, I play the originals as they should be played; in 2D. Even with some of the more advanced source ports, I choose the original sprite art over the optional 3D models and other High Definition textures.
I know Bobby worked on the Duke Nukem 3D soundtrack as well with Lee Jackson. Some of the music on there is pretty damned good. Not as memorable as the Doom soundtrack though, but a worthy mention nevertheless.
"A man chooses, a slave obeys." - Andrew Ryan of Ryan Industries (Bioshock)