辅音前面加a，所以这个单词前面加a

guitar

n. 吉他六弦琴

guitarist

n. 吉他弹奏者吉他手

We like our audiences to sing along and play air guitar.

我们想让观众一边假装弹吉他一边一起唱。

He played all the remarkably groovy guitar parts himself.

非常欢快的吉他声部全都由他亲自演奏。