Songs that evolved into other songs

Bob Pollard has reworked older songs countless times:

Wall and Windows became Hardcore UFOs
Crocker's Favorite Song > Class Clown Spots A Ufo
Tell Me > Tractor Rape Chain
Superwhore > The Who Vs. Porky Pig
Girl From The Sun > Do The Collapse
Reptilian Beauty Secrets > Idiot Princess
Sacred Space > Office of Hearts
Rocket Head > Teenage FBI
many more...