Which Rod Stewart disco single reached number one on the Billboard Hot 100 in 1979?

The Rod Stewart disco single that reached number one on the Billboard Hot 100 in 1979 was “Da Ya Think I’m Sexy?”.

Stewart released the song in November 1978 as the first single from his album Blondes Have More Fun. Although its release began in the previous year, its American chart success peaked in February 1979, when it spent four weeks at number one. That timing explains why the song is associated with both 1978 and 1979.

The track was written by Stewart, Carmine Appice, and Duane Hitchings, and its melody drew on Jorge Ben Jor’s “Taj Mahal.” Its polished dance sound marked a conspicuous move away from Stewart’s earlier rock and folk-rock image. The song also topped the UK chart and became one of his signature recordings.

A common mix-up is “Hot Legs,” another well-known Stewart song, but that 1977 hit did not reach number one on the Hot 100. “Da Ya Think I’m Sexy?” also had a charitable connection: Stewart donated royalties to UNICEF and performed it at the 1979 Music for UNICEF Concert.