Adrian Mann set about building the longest piano in the world in a shed on a farm in Timaru when he was a teenager. Now he's 28 and now the piano resides in his Dunedin workshop. Pianists from all over the world have visited him to play on the 5.7 metre long instrument. Previously when it needed to be moved the firebridage were called in to help. He's just had a visiting Belgium concert pianist visit to play. He explains why he was on such a mission to make a gigantic piano and why it's so popular with musicians.