in no particular order (yet)
Bruce Springsteen and the E Street Band ('99)
U2 (Zoo TV -2x, PopMart, Elevation -3x)
Public Enemy (with U2)
Sugarcubes (with U2)
Fun Loving Criminals (with U2)
Pogues (with U2)
Madonna
Cake
Moby
Beastie Boys (3x, incl. Lollapalooza and Tibetan Freedom '96)
DJ Hurricane (with bboys)
Bono (NetAid)
Wyclef Jean (NetAid)
Counting Crows (NetAid)
Sting w/Cheb Mami (NetAid)
Jewel (NetAid)
Busta Rhymes (NetAid)
Mary J. Blige (NetAid)
Puff Daddy (NetAid)
Jimmy Page (NetAid)
Black Crowes (NetAid)
Zucchero (NetAid)
International Pop Festival (LA '01)
Foo Fighters (Tibetan Freedom Concert '96)
Tribe Called Quest (TF & Lollapalooza)
Pavement (TF)
Richie Havens (2x, TF)
Green Day (L)
L7 (L)
Smashing Pumpkins (2x, TF & L)
John Lee Hooker (TF)
Cibo Matto (TF)
Biz Markie (TF)
Red Hot Chili Peppers
The Rentals (with RHCP)
Ziggy Marley and the Melody Makers (WOMAD)
Peter Gabriel (WOMAD)
Stereo MC's (WOMAD)
Jah Wobble (WOMAD)
Crowded House (WOMAD)
Van Halen
Alice in Chains (with VH)
Boston
Paul Simon/Bob Dylan
The Blacks
Cash Money
No Doubt (2x)
Ednaswap
The Apples in Stereo
American Music Club
The Boo Radleys
Guided by Voices
Superchunk
Standard Deviation
Stereolab
The Mighty Blue Kings
The Roots
Chuck Brown/EU/Trouble Funk
The Ska-talites
Let's go Bowling!
Nusrat Fateh Ali Khan
Dave Matthews Band
Dione Farris (with DMB)
Phish
Pink Floyd
The Rolling Stones
Seal (with the Rolling Stones)
Juliana Hatfield
Arrested Development (L)
Travis
Sonic Youth
George Clinton and PFunk All Stars (2x- Penn and Princeton)
The Samples (2x)
James Brown
Toad the Wet Sprocket
Rusted Root
Sheryl Crow (NetAid, Princeton)
Black Star (at Brown)
Wilco (at Brown)
"Weird" Al Yankovic
Guided by Voices
Grand Ole Opry (various country artists including Brad Paisley)
Ben Folds
The Strokes
Rooney
The Mooney Suzuki