The song they're playing in the background is either an instrumental version of The Zombies "You Make Me Feel Good" or they ripped it off pretty closely.
Uploaded by historicfilms
UPDATE: From the comments: Jonathan King said: "They really did rip that tune off, didn't they? Pretty audacious. The narrator is the quasi-legendary Humble Harvey Miller, an L.A. deejay of yore who glommed onto the local youth market, such as it was, when he became a jock at KHJ-AM, the first 'boss radio' outlet, in the mid-'60s. (I myself attended the Humble Harve Hello Happening, a mega-event, at the Palladium in Hollywood one afternoon in 1966, I imagine it was.) He did time for murdering his wife in the early '70s ... must have been after the pot party shown here."