First recorded by Buddy Holly (US #82/UK #30 1958).
Hit versions by The England Sisters (UK #33 1960), Showaddywaddy (UK #7 1975), Nick Berry (UK #2 1992).
Also recorded by Herman’s Hermits (1965), The Hollies (1980).
From the wiki: “‘Heartbeat’ is a rockabilly song credited to Bob Montgomery and Norman Petty, and recorded originally by Buddy Holly in 1958. It was the last Buddy Holly single to be released during his lifetime. ‘Heartbeat’ covers would subsequently reach the UK Top Ten twice: In 1975, for Showaddywaddy, and again in 1992 when the version Nick Berry recorded it as the theme to the Heartbeat TV series. Herman’s Hermits — who had originally been named The Heartbeats after the song — recorded the song in 1965. The Hollies, who had named themselves after Buddy Holly, made their only attempt at having a hit remake of a Buddy Holly song with a 1980 single release of ‘Heartbeat’ that failed to chart.”