Every summer, the famous all-male acappella choir group from Harvard University, the Krokodiloes, embark on an international singing tour. Currently, the Krokodiloes (careful how you pronounce that!) are back again in Hong Kong. For the third year in a row, at least a dozen undergrad Harvard members will be performing a free concert at the Kowloon Shangri-La's Lobby Lounge tonight at 6.30pm. 'Every year, some members in the group graduate from the university,' a hotel representative said. 'A few of the members who performed here last year have gone but others have joined, so this concert will be different from last year.' Their repertoire includes everything from jazz to classic rock to America's golden era. Past audiences for the choir included the king of Thailand and the US president. The group arrived yesterday from Japan and will be in town until Wednesday. Then it will introduce its acappella sound to Shanghai.