THE quote in the left is an extract taken from the Song of the Pipa,a classic poem written in the year 816 by the well-known Chinese poet Bai Juyi.One day when travelling down the Yangtze River on a boat,he suddenly heard a captivating pipa melody wafting from afar.Greatly moved,Bai tried to trace the origin of the music and then found the pipa player,who had been a court pipa player when she was young.Putting on a soul-stirring pipa performance,the player seemingly intended to tell all of her joy in her prime and haplessness in the mid-life,which struck a chord with the poet who was then undergoing his own struggles.Greatly inspired,Bai penned the Song of the Pipa,which is now recognized as a masterpiece poem.The few lines from this poem provide an elaborate and vivid description of the abundant timbre of the pipa,a four-stringed Chinese musical instrument.