Ampersand 8 will be a night of cutting edge jazz and improvised music. Taking place on May 1 at the Bartos Theater at the MIT List Visual Arts Center, it will feature the Outnumbered, a group of some of New England’s finest post-modern jazz musicians. The Outnumbered showcases the varied compositions of Jason Robinson, Josh Rosen and Charlie Kohlhase as well as musical contributions from Curt Newton and Bruno Raberg. Opening will be Carl Testa, a key member of the New Haven improvisation scene, performing on solo bass and electronics.