Concentration 20 is the third studio album by Japanese singer Namie Amuro, released July 24, 1997 by Avex Trax. The album's genre is a fusion of styles including pop, dance and rock. Unlike Amuro's previous effort, Sweet 19 Blues, which primarily had lyrics written by Tetsuya Komuro, Concentration 20's lyrics were mostly written by Marc Panther. Komuro did, however, compose and arrange all of the album's songs and wrote the lyrics to three of them.