这位著名歌手的告别演唱会被视为他的绝唱，完美展现了他四十年的音乐生涯。

The legendary singer's farewell concert was regarded as his ___swansong, perfectly showcasing his four-decade music career.

这场告别音乐会是他作为钢琴家的绝唱。

This farewell concert was his ___swansong as a pianist.