Theme-Jam-Theme songs

List the mostly-psychedelic-era songs that consist of a theme, then a jam of an indeterminate amount of time, then a resurgence of that theme.

Instrumentals:
Pink Floyd - Interstellar Overdrive
Led Zeppelin - Mody Dick
Rush - YYZ

Non-instrumentals:
Pink Floyd - Echoes (go figure)
Innagaddadavita
Light My Fire

“Blinded by the Light” as performed by Manfred Mann?

Sonic Youth’s “Silver Rocket” isn’t remotely psychedelic, but it fits the general pattern.