Impossible to narrow it down to one performance.
Rush at Oakland Coliseum Arena, 1981
Van Halen at Boston Garden, 1981
Ozzy Osbourne (with
Randy Rhoads) at Cow Palace, 1981
ARMS concert for Ronnie Lane at Cow Palace, 1983 -
Jimmy Page, Jeff Beck, and Eric Clapton all on the same stage.
Stevie Ray Vaughan in Austin, TX, 1988
Rage Against the Machine in San Jose, 1996 - Rowdiest concert I've ever been to. The mosh pit failed because of the crush of the crowd. You had no control over your positionthe wave of the crowd would displace you several feet in any direction. By the end everyone was dripping wet. Apparently the concert was recorded and is on YouTube. I linked to one of the songs from that concert.
Rush R30 tour at Shoreline, 2004 - Seventh row, center. Best seats I've ever had.
Also:
Andrs Segovia at Masonic Auditorium, 1984 - Segovia was 91 years old at the time. Past his playing prime, but he was a legend.
Narciso Yepes - don't remember the year
Every
Lila Downs concert I ever went to
Every
Badi Assad concert I ever went to
Every
Michael Hedges concert I ever went to
Every
Pierre Bensusan concert I ever went to
Worst concert I ever went to was
Stanley Jordan. He put everyone to sleep.
Second worst concert was
Sharon Isbin. I love her playing but she has terrible stage presence.