A National Public Radio (NPR) affiliate whose primary market is Washtenaw County (Ann Arbor/Ypsilanti) and the surrounding area, WEMU carries the standard NPR news magazines All Things Considered and Morning Edition. In addition to other NPR and Public Radio International (PRI) information and cultural programming, WEMU has a primary music format of jazz and blues with specialty programs in Latin and roots music. The station has featured primarily a jazz format since February 1977, although it also features Gregg McVicar's syndicated "Undercurrents" adult-alternative music program during overnight hours. WEMU also hosts the EMU sports network and carries EMU football and basketball broadcasts.
WEMU began broadcasting at a frequency of 88.1 FM in 1965 from the Quirk Building; in 1976, the station moved to King Hall. In October 1977, WEMU changed to its current 89.1 FM frequency. Located online at WEMU.org, the station streams live 24 hours a day.
WEMU is licensed for HD Radio operations, and broadcasts a mixed format of traditional and smooth jazz on its HD2 side channel. The HD2 formerly aired a mix of folk, roots and Americana music.