See Hear celebrates the sign song phenomenon with a special Culture Review. The team go to Helsinki to meet rappers Signmark, who have recently been snapped up by a major record label after their videos became an international internet sensation. They also meet inspirational British sign singer Jayne Fletcher and debate what makes sign song a creative art form rather than mere visual karaoke. Daryl Jackson chairs the discussion with guests Jonathan Reid, Stuart Anderson and Deepa Shastri. Plus, Memnos is back with another of his Stories Behind the Signs.