band indicator

例句：

1. 1. The band leader used a band indicator to indicate the start of the song.
   乐队指挥使用乐队指示器来指示歌曲的开始。
2. 2. The band wanted to add a new instrument to their lineup, so they bought a new band indicator.
   乐队想要加入一个新的乐器，所以他们买了一个新的乐队指示器。
3. 3. The band was playing in front of a large audience, and the band leader used a bandindicator to keep track of the music.
   乐队在一个大观众面前表演，乐队领袖使用乐队指示器来跟踪音乐。