Hong Kong elderly singers challenge themselves with a cappella With a song list ranging from old hits from the 50s and 60s to contemporary Mandopop, a group of elderly singers in Hong Kong come together in an "a cappella" choir that delivers performances around the city. The group, which sings without any instrumental accompaniment, have been trained by a cappella specialists who put together different kinds of choirs for musical events in Hong Kong. IMAGES AND SOUNDBITES