Jim Marshall shot the iconic "At Fillmore East" album cover photo of the Allman Brothers Band ... bumblebee-like Duane solo on "Blue Sky," one of his last studio performances with the band.

VIEW THE PHOTOS: Week's Best Star Sightings, March 21 - 27 The Mecca in March for Allman fans ... Eric Clapton! Last night there was no guest, but a tribute to Duane, who died in 1971, was ...