Oasis/Glasvegas, Roundhouse, London

Oasis closes the BBC Electric Proms with the most intimate and forceful gig of their tour so far. But the novelty comes from support band Glasvegas, recently No 2 in the album charts with their debut LP, and pretenders to Oasis's throne.

"They're the reason that we're even in a band," singer James Allan confesses to the crowd. "The reason that I even picked up a guitar is Oasis." And Glasvegas is in so many ways the band Oasis once was.

They adore the echo-drenched pop of Phil Spector and Suicide as the Gallaghers once spliced The Beatles with punk. Both bands draw heavily on working-class backgrounds. But where Oasis reacted with football-chant defiance, Allan picks at the pain of his past and makes it grand. The catch in his throat as he sings "Daddy's Gone", a hymn to his devastation when his father walked out, may be showbiz. But Glasvegas otherwise radiate urgent faith.

It isn't the material to provoke the joyous, beery mêlée Oasis elicit when they walk on. Watching them earlier on this tour, a gradual improvement in energy was undercut by a feeling of sadness, of a search for lost greatness. The intimate Roundhouse proves the right place to make their last stand as a relevant band. Their buzzing, thick sound is enclosed here, bouncing claustrophobically off the walls. Liam, looking ready to punch his own shadow, roams the small stage like a caged beast. Noel is hampered by broken ribs still weeks from healing. For "The Masterplan" he is bolstered by the Crouch End Choir, tonight's concession to the Proms' stated spirit of adventure. He introduces Daniel Craig and Russell Brand up in the rafters, but dedicates "The Importance of Being Idle" to Glasvegas. "Apart from the lyrical content," he can't help adding, "because that could do with some work." He has never let Allan's lacerating self-exposure into his songs. And yet new album Dig Out Your Soul provides, in "Falling Down", his first moment of middle-aged doubt. He sings his best song, "Don't Look Back in Anger", like a comforting friend. Letting such warmth in might be his salvation.

Oasis end these Proms instead with "Pomp and Circumstance", inserted by the generally redundant choir into The Beatles' "I Am the Walrus". They are a band who cannot reinvent their sound, only reinforce it. Sensitivity and the future may be Glasvegas's, but tonight belongs to the sheer force of Oasis's past.