ABBA releases "Waterloo" 1974

ABBA released their second studio album Waterloo March 4, 1974.  It was their first album to be released internationally.  The single Waterloo was released the same day, and it was the song that won ABBA the 1974 Eurovision Song Contest.  

The single reached #1 in many countries.  It reached #6 on the Billboard Hot 100, and ended the year at #49. The album only reached #145 on the Billboard 200 charts.  

The album generated the singles Honey, Honey, which peaked at #27 US Billboard Hot 100, and Hasta Manana.

Rod Stewart's "Da Ya Think I'm Sexy?" reaches #1 1979

The first single from Rod Stewart's Blondes Have More Fun, his ninth studio album, Da Ya Think I'm Sexy? reached #1 on the Billboard Hot 100, February 10, 1979 and stayed there for four weeks.  It went to #1 in the UK, Canada, and Australia.  Stewart donated the royalties from the song to the United Nations Children's Fund (UNICEF).

Billboard ranked it as #4 on its Top Singles of 1979 year-end chart. The song is certified double-platinum in the US have sold at least 2,000,000 copies.