Discovered by Les Paul in the late 1940s, flanging — the “swooshing” sound caused by mixing two identical recordings together while one recording is slightly relayed — really came into vogue in the late 1960s, when psychedelically-inclined artists like The Beatles, Jimi Hendrix, The Small Faces, The Nazz and The Status Quo employed it to dose their songs with an extra degree of trippiness.... Read the full article in the Stompbox blog.
http://stompboxbook.com/forever-flanged-10-great-flanger-powered-tracks-pedal-playlist/
