Donna Summer scored her first No. 1 hit on the 'Billboard' Hot 100 with her cover of Jimmy Webb’s “MacArthur Park” on 1978.

Some of John Lennon's best songs were written during his solo career; and one of them was released shortly before his death.

There's no doubt Charli XCX had one of the biggest albums of the year — and with her sixth studio album, Brat, she launched not only a prominent music era, but also a cultural movement.