Look out over the audience leaping around ecstatically, arms aloft under the spotlights, and you might easily mistake this for a throbbing rave rather than the launch party for the second album by what is essentially a brass band playing street music.

Look out over the audience leaping around ecstatically, arms aloft under the spotlights, and you might easily mistake this for a throbbing rave rather than the launch party for the second album by what is essentially a brass band playing street music.

Orkestra del Sol have, though, as quickly gathered an enthusiastic following who can pack the downstairs floor of the Queen's Hall as they have skilfully assimilated the traditions of eastern Europe, calypso, samba and much more besides. As Tom Adams - the band's wind-up fiddler in more ways than one - proclaims in his mirthful introductory ditty, this is the orchestra of the sun and of the soul. He doesn't need to add "of the fun", because that's there in spades.

Indeed, the opening number, Reinventing the Wheel, is a kind of manifesto, with sun, soul and fun in its big, bumping, sousaphone rhythm, wailing reeds and laughing melody, and while tempos and moods may change, the circus-like sense of theatre ensures that attentions can't afford to wander. You'd miss at your peril trumpeter Phil Cardwell's big moment as a 12-year-old boy caught up in the Campsie feta cheese wars, complete with Godfather-like lament, or Calypso Collapso's comically threatening storyline. And as Adams goes off into the audience on his unblinking clockwork-toy travels, there's just the teeniest concern that he might not be seen again.

Even mention of Seafield Sewage Works can't detract from the exotic brassy flavours that accompany it and as edges become blurred between polka and pogo, the PR's suggestion that this may prove to be the sound of summer 2008 begins to read like short-termism.