Avi Buffalo at Glastonbury 2010

Who: Avi Buffalo Where and when: Park stage, 1.40pm Sunday. Dress code: It's the "Pitchfork reader in sweltering heat" look: shorts and obscure band T-shirts. What happened: Avi Buffalo refresh an audience lying stunned both by the heat and three days of relentless raving. One of this year's most bigged-up bands, their trump card is Avi Zahner-Isenberg's guitar playing. Chiming, looping, limpid, he has Johnny Marr levels of virtuosity, astounding in someone so young. Sometimes the tremelo-assisted "shimmering shards" (as Smash Hits would have put it) threaten to evaporate into self-indulgence, but there are great tunes here too. The unfortunately titled Summer Cum is Avi Buffalo's four-on-the-floor moment, while the melody of What's In It For lingers like a heat haze. Who's watching: "You're so bronzed and golden," says keyboard player Rebecca Coleman to the crowd. "We're just dirty," someone shouts back. High point: Zahner-Isenberg losing himself in his music. He shuts his eyes, he jerks his head around, he does a strange approximation of Chuck Berry's duck walk, but it's the opposite of posed. Low point: The band fretting about the sound (which is fine). In what is perhaps the first instance of a band crowdsourcing the sound mix, at one point Zahner-Isenberg asks the audience what they think of it and whether they want anything turned up or down. In a tweet: Avi Buffalo leave Glastonbury dazed and enthused.