@edgarblythe,
That's correct, I think that was a Phil Spector group (The Champs).
Glen had done much session work for Beach Boys for around a year. and so knew all of their music (not the lyrics, though). He replaced Brian Wilson who was ill and suffering what was to be diagnosed as a nervous breakdown late in 1964-1965. Glen toured with the BB for 3-4 months but it was Brian Johnston who replace Brian W. on the road while he attempted his recovery.