The Blackstones - Only A Smile. Classic Jamaican harmony meets modern lovers vibes in this UK roots gem. Features "Only A Smile," "Permanent Love," and "Under Your Spell." Few vocal groups have carried the flame of Jamaican harmony singing into the modern age with the grace and commitment of The Blackstones. Formed by Leon Leiffer in 1974, this UK-based trio - joined over the years by singers including Tony Mahoney, Junior Bailey, and most recently Amanda J Christos - has become a cornerstone of British reggae.