Replaces the sitting Witch's theme music with Portal 2's turret easter egg audio in all campaigns (with the sitting Witches only). Portal 2 & the audio is not made by me.
Replaces the Tank's theme music into the famous Beethoven's Virus in all campaigns. Original song is not made by me. Now, I know it may not fit the tank perfectly, but it is to share some mods for people who want to try.
1 Beethoven Virus - Tank Music Replacement 07/12/12