Unused Doom music

On June 17, 2007, John Romero released a collection of Doom music created by Bobby Prince that was not used in the final game, via his personal website planet rome.ro. A few of them are older versions of tracks used in Doom and Doom II; in some cases, the bases for these songs are more evident, whereas the final versions are altered to make the similarities less apparent. They have since been used in various PWADs.