RADIO

Firesign Theatre, the counterculture radio ensemble that rose to prominence in the 1960s, will reunite for a special broadcast in October. Their live Boston show, “Hollywood Madhouse,” kicks off National Public Radio’s five-part Radio Movies, hosted by Firesign’s David Ossman. Firesign Theatre rose to prominence on then-mighty KRLA in Los Angeles, where it lampooned then-Mayor Sam Yorty in the soap opera-ish spoof “Just Plain Sam.”