yīn / yuè / huì / shàng / gāng / qín / jiā / yǎn / zòu / le / yì / shǒu / zhù / míng / de / biàn / zòu / qǔ音乐会上,钢琴家演奏了一首著名的变奏曲。At the concert, the pianist performed a famous variation.