Bachtopus is an accordion ensemble from New York City that performs chamber music by contemporary composers and Johann Sebastian Bach. The ensemble is one of the few accordion ensembles in the United States that focuses on living composers. Having established a large repertoire in just a few years, Bachtopus seeks to perform more original compositions, commissioned works, and contemporary music that is interesting, accessible, and grounded in traditional folk music.

The accordion is a portable and versatile instrument that has been adopted by folk musicians around the world. Yet, this relatively new instrument is only recently receiving attention from conservatories, composers, and patrons of chamber music.Their new commissioning fund is designed to (1) promote awareness of modern accordion music in Brooklyn, (2) provide composers with an opportunity to write for the instrument, and (3) expand the repertoire for accordion ensembles.