How do you describe the indescribable? The Willem Breuker Kollektief sounds like the pit band from a Kurt Weill-Bertolt Brecht musical; the show they put on is something like Spike Jones, or Sun Ra meeting Madame Florence Foster Jenkins, or the left-wing musical equivalent of the Naked Gun movies–but all of these on a high musical level. The Kollektief’s raw material is modern Europe’s high and low culture: Rachmaninoff collides with rock, sleazy Valkyries ride merry-go-round rhythms, tangos are arthritic and polkas stagger wildly, and boogie and bebop are strangled into a free-jazz hell. It’s all played with straight faces to the pounding of nonstop rhythm, and slapstick routines are an inevitable part of the performance–this band must be seen to be believed. It’s often impossible to tell what’s serious and what isn’t, for into all the madness they may interject a straightforward piece by Gershwin, Weill, or a Baroque composer. Even more than satire these ten subversives love drama; they’re from Holland, where jazz and theater combined are a tradition. What’s most obvious is the quality of the musicianship, especially that of the marvelously lyrical alto saxophonist Andre Goudbeek and chief composer/multiwoodwind artist Willem Breuker, who has been a major force in European jazz’s distinctive renaissance for more than two decades. Saturday, 8 PM, Southend Musicworks, 1313 S. Wabash; 939-2848.