A collection of previously unreleased songs from the vault of Prince is coming out this fall. Warner Brothers records announced today–on what would’ve been the Minnesota music icon’s 60th birthday–the release of “Piano and a Microphone 1983”. The 9-track album features a private rehearsal from Prince’s home studio in Chanhassen recorded just before he broke big with the “Purple Rain” album and movie. The new record is due out on September 21st.