WIKIPEDIA:

“ Tight Fit are a British pop group who had a number of hits in the early 1980s, including a UK No.1 (for three weeks) with their cover version of "The Lion Sleeps Tonight" in 1982. The group had two completely different line-ups - the first (a group of session singers) in 1981 and a male/female trio in 1982.

History
In 1981, record producer Ken Gold came up with the idea to record a single made up of a medley of 1960s songs. The medley trend was in full swing at this time, following the success of Starsound and their Stars on 45 singles. He put together a group of male/female session singers and released "Back to the 60s" under the group title, Tight Fit. The song became a hit in the summer and reached No.4 in the UK Singles Chart. Instead of the sessions singers who sang on the record, a group of models were hired to mime to the recording when Tight Fit appeared on the BBC's music show Top of the Pops. A follow-up, "Back to the 60s Part 2" was released soon after and also hit the UK Top 40.
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