One of the Doom community projects I participated in came out literally yesterday.
It's a full game mod (they call it a megawad in Doomworld) that combines every map from Doom and Doom 2 into one. So you have Hangar from Doom + Entryway from Doom II, etc.
I contributed to this mod with four MIDIs, which you can find in the music section of the site.
Do you wanna play the mod? Download it from its Doomworld thread