In 1978, seven years after lead singer Jim Morrison died and five years after the remaining members of the band broke up, Ray Manzarek, Robby Krieger & John Densmore reunited and recorded backing tracks over Morrison's poetry.
The Doors wrote this in 1965, when they were first starting out. For the Morrison Hotel, they wanted to get back to their early sound and felt recording this would be a good way to do it.