Best concert you've attended

Certainly Jimi Hendrix and Moby Grape in 1967 stands out...Peter Paul and Mary with Thelonius Monk at the Hollywood Bowl in 1964...Ravi Shankar in Honolulu in '68...I worked with Julian Lage (mixed the show) before having heard him (!) and his trio (Scott Coley and Kenny Wolleson) and THAT was amazing. My band opened for Zep in 1969 during part 2 of their first tour of the US...a memorable time was had by all! 

Oh then there was the Stones free concert at Hyde Park, London in 1969.  But that was a couple of years ago!

@ubercar71s - I understand your selection.  I saw them in 1975 (Kieth Moon still on drums) when they played a 20+ song set heavy with Tommy, Quadrophenia, and Who’s Next tracks.  An outstanding event for sure!

I saw The Who Quadrophenia tour at Boston Garden,  truly amazing.   Keith Moon hit those skins so hard, he was amazing, Townshend did his windmill for almost 90 seconds straight, John Entwistle bass was so strong and gut wrenching and Roger Daltry’s scream towards the end of Won’t Get Fooled Again was something I have never forgotten.   Saw the band 3 more times but they were never as tight as they were that night.  

Forgot to mention CSN&Y at Boston Garden on their first tour after they broke up and got back together.  The guitar playing, the harmonizing was so special.  David Crosby seemed so happy, they were on my bucket list.  

Not sure I can specify The Best I have attended in the last 50+ years. Definitely the best I have attended the last ten years though, would be last fall, Roy Thompson Hall, Toronto Symphony Orchestra season opener, Carmina Burana. Over 250 people playing/singing at the same time in perfect harmony… wonderful.