Jarkko Kalevi Ahola (born 24th August 1977 at Toijala, Finland) is the lead singer of Finnish power-metal band Teräsbetoni. He has also sang on Dreamtale's album Difference. J. discovered his love for music while in Junior High School. Throughout his career, J. has constantly been active with numerous different bands/projects and has put out six of his own demos. A few of the bands J. has been involved with are Dreamtale, Cosmic Spell and Helmisetti.