Meanwhile, young crooner Ed Sheeran looked positively pedestrian in comparison, though with his shaggy red hair the people far off in the cheap seats must have wondered why Prince Harry popped up on stage with an acoustic guitar.

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Electric guitar collecting also focuses on an instrument's provenance (past ownership) whereas acoustic guitar collectors emphasize the importance of tonal quality and craftsmanship.

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Frankly, "Case" sounds on the verge of imploding as it is, with an acoustic-guitar solo that might be called flamenco if it weren't so scattershot and an otherwise-simple quarter-note pulse, which creates the illusion that the song's center is constantly shifting.

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On the screen of his MacBook, Evan Lowenstein watches singer-songwriter Jason Manns strumming an acoustic guitar in his apartment, where the only audience member is a snoozing dog.

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Attractions include the all-new acoustic cabaret (featuring punk bingo with Max Splodge and an acoustic guitar performance by Hazel O'Connor) and a ska and street punk theme on Saturday with The Beat and Roddie Radiation from The Specials.

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