Absolutely true. Freddie wrote this hit at Bayerischer Hof Hotel in Munich as a tribute to Elvis Presley.
Roger Taylor had said that Mercury wrote it in just 10 minutes while lounging in a bath.
Mercury took it to the studio shortly after writing it and presented it to Taylor and John Deacon. The three of them, with their then new producer Reinhold Mack, recorded it at Musicland Studios in Munich. The entire song was reportedly recorded in less than half an hour (although Mack says it was six hours). Having written “Crazy Little Thing Called Love” on guitar and played an acoustic rhythm guitar on the record, for the first time ever Mercury played guitar in concerts during this song.
It became the group’s first number-one single on the Billboard Hot 100 in the US in 1980, remaining there for four consecutive weeks.It topped the Australian ARIA Charts for seven weeks. The song peaked at number two in the UK Singles Chart in 1979.
“Crazy Little Thing Called Love’ took me five or ten minutes. I did that on the guitar, which I can’t play for nuts, and in one way it was quite a good thing because I was restricted, knowing only a few chords. It’s a good discipline because I simply had to write within a small framework. I couldn’t work through too many chords and because of that restriction I wrote a good song, I think.”
— Freddie Mercury