concerts
A concert is a performance of music.
a short concert of piano music.
一场简短的钢琴音乐会。
I've been to plenty of live rock concerts.
我到过很多摇滚音乐会的现场。
in concert
If a musician or group of musicians appears in concert, they are giving a live performance.
I want people to remember Elvis in concert.
我希望人们记住现场表演的埃尔维斯。