famous piece of music; excellent song; (musical) masterpiece
このピアノ曲は世界中で演奏される名曲だ。
This piano piece is a masterwork performed all over the world.
その名曲は百年以上経った今も人々に愛されている。
That famous piece is still loved by people even after more than a hundred years.
名曲を聴きながら勉強すると集中できると言う人も多い。
Many people say they can concentrate better when studying while listening to famous music.