Starting at just after 1 minute in the linked video, you'll hear the sound of an early synthesizer called a 'Musitron'. It's the 'bridge' part of the new hit for Del Shannon, called 'Runaway'. Starting on April 24, 1961 It tops the US charts for 4 weeks ... and soon becomes a UK#1 as well.

https://en.wikipedia.org/wiki/Runaway_(Del_Shannon_song)

Several years before the first Moog is sold, the 'Musitron' is a form of Clavioline (invented in 1947, but heavily-modified and played by Max Crook.) It's also heard as the bridge in another Shannon hit, 'Hats Off for Larry.' This is certainly one of the first times that 'electronic music' tops the charts.

https://en.wikipedia.org/wiki/Clavioline

The making of 'Runaway': www.delshannon.com/runaway.htm

https://www.songfacts.com/facts/del-shannon/runaway