乐队 (yuèduì) means "band" or "musical ensemble," referring to a group of musicians who perform together. It can describe any type of musical group, from a rock band to an orchestra section.
我们乐队下个月要在酒吧演出。
Wǒmen yuèduì xià ge yuè yào zài jiǔbā yǎnchū.
Our band is performing at a bar next month.
这支乐队的吉他手弹得特别好。
Zhè zhī yuèduì de jítā shǒu tán de tèbié hǎo.
This band's guitarist plays really well.
他从大学开始就组了一支摇滚乐队。
Tā cóng dàxué kāishǐ jiù zǔ le yī zhī yáogǔn yuèduì.
He started a rock band back in college.