First recorded by Louise Cordet (1964).
Hit version by Gerry & The Pacemakers (US #4/UK #6 1964).
From the wiki: “The song, co-written by Gerry Marsden (Gerry & The Pacemakers), was given first to Louise Cordet, a singer who had previously toured with the group as well as with The Beatles. Her version was released on Decca Records in February 1964.
“Gerry & The Pacemakers then decided to produce their own version. It was released in April 1964 as the group’s fifth single in Britain, where it reached #6 in the UK singles chart. In the US, the recording was the breakthrough single for the group, rising to #4 in the Billboard Hot 100. The record, like the group’s earlier releases, was produced by George Martin.”
Gerry & The Pacemakers, “Don’t Let the Sun Catch You Crying” (1964):