This evening's installment of Dangerous Curve's aptly named Is it Music? series outdoes itself with a lineup featuring collaborative and solo "musical" experiments. The evening is built around the gentle earthquakes of David Chiesa's double and electric basses, the Rimbaud-esque violin improvisations of fellow Frenchman Mathieu Werchowski, the anything-can-be-a-drum percussion of Marcos Fernandes, the micro-minimal electronic trances of Robert Montoya, and Anna Homler, who sings jazzy, mesmerizing love songs in made-up languages.