Jarkko Kalevi Ahola (born 24th August 1977 in Toijala, Finland), or J. Ahola, is the lead singer, bass player and one of the songwriters in the Finnish power metal band Teräsbetoni. After Teräsbetoni went on a break in 2011 Ahola started a new hard rock band, AHOLA in which he plays the rhythm guitar and sings in English. He has also written most of the songs on AHOLA's two albums: Stoneface (2012) and Tug of War (2014). J. Ahola is part of the Finnish symphonic heavy metal supergroup Northern Kings together with Marco Hietala (Nightwish