The song "Havana" by Camila Cabello is in the original key of B minor. It was released as a single in 2017 and later included in her debut solo album, "Camila." The track features guest vocals from rapper Young Thug. Cabello co-wrote the song with several other songwriters, including Pharrell Williams. A curious fact is that the song's intro is an interpolation of the instrumental "Piano Sonata No. 14" by Ludwig van Beethoven. The melody of "Havana" is upbeat, with a combination of Latin-pop and R&B elements, creating a catchy and infectious tune.