Group of the Altos

Though they share a guitarist (Daniel Spack) and a similar love of instrumental post-rock with Collections of Colonies of Bees, Milwaukee’s Group of the Altos flaunts a far deeper kitchen sink than that quintet, working trumpet, cello, saw and clarinet into suites that trend darker than Colonies of Bees’ sprightly instrumentals. The group covers a lot of territory, touching on the requisite rock, jazz and classical influences but also making time for unlikely tropical tones and any other drive-by tangents and surprise twists they can fit into their sprawling compositions. The group plays Summerfest’s all-local Groove Stage tonight before a 9 p.m. performance from the art-punk quartet Worrier.