a.pe.ri.od.ic is a Chicago-based performance collective featuring post-Cagean notated, acoustic, experimental music. Founded in 2010, a.pe.ri.od.ic’s repertoire explores the indeterminacy of various musical elements including instrumentation, structure, pitch, and/or duration. Drawn to works of sparseness, contemplation, and quietude, this “daring group” (Chicago Reader) focuses on scores primarily notated with prose. Led by Nomi Epstein, the ensemble has commissioned, premiered, and recorded works by composers such as Michael Pisaro, Eva-Maria Houben, Jürg Frey, James Saunders, and Pauline Oliveros. a.pe.ri.od.ic's 2014 debut album release, more or less, featuring the music of Jürg Frey was listed as one of the Best New Albums of the year in the Chicago Reader, Big City, and Rhapsody.