Artist Biography JAF - Juan Antonio Ferreyra, is the name of an argentinean singer-songwriter, born in Buenos Aires, in 1958. He started playing in La Maquina Infernal in the 1970s, mainly focusing on cover versions of Creedence Clearwater Revival, The Beatles and Ten Years After. In 1978 he formed La Banda Marron, where he took a turn into rock n' roll. In the 1980s he was a member of Riff, where he played with Pappo, and recorded a couple of records with them. Since 1989 he's been a solo artist.