The song peaked at number two in the UK Singles Chart in 1979, and became the group's first number-one single on the Billboard Hot 100 in the US in 1980, remaining there for four consecutive weeks.
The track topped the Australian ARIA Charts for seven weeks.
Having composed "Crazy Little Thing Called Love" on guitar, Mercury played rhythm guitar while performing the song live, which was the first time he played guitar in concert with Queen.
The song was played live on 20 April 1992 during The Freddie Mercury Tribute Concert, performed by Robert Plant with Queen.
The style of the song was described by author Karl Coryat as rockabilly in his 1999 book titled The Bass Player Book.
As reported by Freddie Mercury in Melody Maker, 2 May 1981, he composed "Crazy Little Thing Called Love" on the guitar in just five to ten minutes.
The song was written by Mercury as a tribute to Elvis Presley.
Roger Taylor added in an interview that Mercury wrote it in just 10 minutes while lounging in a bath in the Bayerischer Hof Hotel in Munich during one of their extensive Munich recording sessions.
Although Mercury would play an acoustic-electric twelve-string Ovation Pacemaker 1615 guitar and later on an electric six-string Fender Telecaster, both owned by May, in the studio he recorded it with a six-string acoustic with external mics. Mercury also played the original guitar solo on a version which has been lost.
United States (RIAA) Platinum certification with 2,000,000 sales.