... was Iron Butterfly + Spirit at the old Fillmore Auditorium in the summer of 1969... Spirit opened and played a then-brand-new song called "I Got A Line On You"... Iron Butterfly headlined, closing of course with the long version of "In-A-Gadda-Da-Vida"... at the last note a huge wall of fire shot up across the front of the stage... when the fire died down, the band and their instruments were gone... very cool ending.