British rock musician Rick Wakeman, best known as keyboardist for the progressive rock band Yes, has performed a live piano concert for an audience of 150 rescued moon bears at the Animals Asia sanctuary in Tam Dao national park, Vietnam. Playing original compositions written specifically for the bears on a Yamaha grand piano, Wakeman — who has sponsored rescued bears since 2016 — aimed to raise awareness of the bear bile trade, in which bears are kept in cramped cages and have bile extracted from their gall bladders for use in traditional medicine; the practice is the fourth-largest illegal wildlife market in east Asia and has contributed to nearly a third of Asiatic black bear populations being lost worldwide over the past 30 years. Vietnam has recently banned the trade, but around 125 bears remain in captivity on former bile farms, with four dying each month, making their transfer to sanctuaries increasingly urgent.