Music: Grateful Dead
This is one of the components of the suite That's It For The Other One on Anthem Of The Sun. The original title probably didn't bear any definite link to a portion of the suite, but it now seems to have evolved into the title of the short jam between Cryptical Envelopment and The Other One.
Note that the spelling on all versions of "Anthem Of The Sun" is "Quadlibet" not "Quodlibet." "Quodlibet" is the normal spelling of the philosophical/musical term. I don't know if the Dead's spelling, "Quadlibet", is a mistake or a pun.
See the notes on That's It For The Other One for additional information.