number, 1963. University of Michigan Bentley Historical Library. Sheff, Robert and Mark Slobin. “Music Beyond the Boundaries,” from Generation, Vol. 17, No. 2, 1965. University of Michigan Bentley Historical Library. Weingarten, Emily. The Music of ONCE: Perpetual Innovation. July 2008. See also List of electronic music festivals Live electronic music References External links Jacobson, Mark. "ONCE.MORE 50th Anniversary Festival Guide". November 2, 2010 Lelievre, Roger. "ONCE upon a time in Ann Arbor." The Ann Arbor News. Sunday, April 29, 2007 Tai, Paul. Liner notes for Music from the ONCE Festival: 1961-1966. New World Records 80567. Baise, Greg. "ONCE again" "the metrotimes". Wednesday, October 27, 2010 Stryker, Mark. "ONCE concerts blend '60s and today". "Detroit Free-Press". Thursday, October 28, 2010 Firant, Laurel. "ONCE upon a time in Ann Arbor: Festival revisits groundbreaking music movement" "annarbor.com". Friday, October 29, 2010 American artist groups and collectives