Maintaining the ability to surprise and inspire your partner is just as key to longevity in improvised music as it is in romance — and the duo/couple Ab Baars and Ig Henneman seem to manage both. Multi-reedist Baars is a member of the legendarily eccentric Dutch ensemble the Instant Composers Pool Orchestra, while violist Henneman has collaborated with many of that group’s members as well as composing for somewhat more conventional orchestras. Together, the two craft taut, precise avant-chamber pieces, thrilling and enthrallingly textured whether composed or invented in the moment. For their Philly debut, they’ll be performing their new program, Autumn Songs, inspired by poetry about the season. No doubt they’ll vividly conjure the brisk chill and stark beauty of fall.
Sat., Nov. 3, 8 p.m., $15, Philadelphia Art Alliance, 251 S. 18th St., arsnovaworkshop.com.