Spektrum, Digital Mystikz, Fujiya & Miyagi, Triptych, Classic Grand, Glasgow, 28 Apr

The Classic Grand has a big slice of the Triptych pie this year, tonight playing host to Spektrum and the Digital Mystikz, among others. Spektrum are electro-funky and upbeat, like a young ESG. They open proceedings upstairs and, despite missing one member, they move the crowd from head-nodding to collective bootyshaking within two songs. The Mystikz and Loefah embrace dubstep, that dark descendant of reggae. More dancehall than drum and bass, their dubstep is the menacing soundtrack a skunk-fuelled freakout, with basslines that really need to be heard live to be fully appreciated. In fact, for this live show they have an extra dozen or so speakers to make sure the soundsystem vibe gets across; bass-heavy, rolling, and fiercely cool grooves. At one point the bass gets so damn loud, and the dancers so damn hectic, that the record won't even play through the drop. The track 50,000W has to be re-started five or six times. Sgt. Pokes reckons the floor must be made of rubber to bounce so much, exlaiming, "The Glasgow vibe is massive! You gotta stand still! It's a paradox!."

You have to feel sorry for Fujiya & Miyagi, however, who follow on from Spektrum and play while the crowd-pleasing, booth-destroying Loefah and Mystikz are on. Their guitars come off like a competent 21st century take on the likes of The Shadows - something your parents probably wouldn't mind you playing in their car. While they're doing the nice, the Mystikz and Loefah are busy wrecking people's heads downstairs. Although the dubsteppers are probably not for everyone, it's clear from the performance tonight that they will be the ones talked about in fifty years. You should see them soon, before everyone starts telling you that you had to be there. [James Blake]