I'm an old guy now that happened to be in the right spot at the right time for meeting some folks listed on here.
Met Levon Helm in 1977 in Little Rock, AR. He banked with my employer. Good guy. Met Gregg Allman and the rest of the band in St. Louis at Kiel Auditorium in 1981 I believe it was. Had breakfast together with them the following morning at the hotel. A first cousin on my ex-wife's side was in the band. Got to sit back stage at that one. Gregg was going through a sober period. Dickey and the rest of the gang were not.
So my #1 and #2 are The Band and The Allman Bros Band. Loved their music before I met the guys. Was not a fan of the ABB's music when the cousin was playing for them, but it was an interesting time. My next faves are The Eagles, Bob Seger and the SBB, and Chicago. If I could squeeze in Tom Petty I would.