This is a 15 minute clip of Let's Go (not Music Hop), a Canadian TV show from Winnipeg in 1967. The host is former Guess Who singer Chad Allen, who is dressed like he's on his way to a 1962 hootenanny. He does "Tell It Like Is" w/a fairly accurate Aaron Neville impression. I can't ID the blonde girl singer.
A brief biography of The Four Plus 1 by Richie Unterberger A British R&B band of the mid-1960s, the Four Plus One (also spelled in various permutations such as Four + 1, 4 Plus One, etc.) made just one unmemorable single. However, they're remembered for including two members, vocalist Keith West (then Keith Hopkins) and rhythm guitarist Junior Wood, who would form one-half of Tomorrow, one of the premier early British psychedelic groups. The Four Plus One were already playing by the time West, who also played harmonica, joined them after seeing their ad for a singer in Melody Maker. Their lone single, 'Time Is On My Side"/"Don't Lie to Me," came out in January 1965 on EMI, and stood little chance of hitting considering the Rolling Stones were having success with the song at the same time (and even considering that the Stones' version was released as a single only in America, being relegated to an LP track in the UK). The B-side, "Don't Lie to Me," was a decent if workmanlike Chuck Berry cover. After the single, they changed their name to the In Crowd, playing more soul- and mod-oriented material, and releasing three singles, guitarist Steve Howe joining in time for the second. The In Crowd, after further stylistic growth, evolved into Tomorrow with the addition of drummer Twink Alder. Both sides of the Four Plus One single are on the Keith West compilation Excerpts from ...Groups & Sessions 1965-1974. Four Plus One | Biography & History | AllMusic
This is from the 1966-67 season. Chad wouldn't be host until the next season, the host is the guy in the dark jacket (Ray St. Germain). The blonde is Lucille Emond. And here she is with Fred Turner and The Pink Plumm: