唱歌比赛英文是Singing competition。
例句：
Meanwhile ， I'd like to invite you to act as a judge for the singing competition.
同时我想邀请你担当歌唱比赛的评委。
There is going to be a singing competition this evening.
今天晚上将有一场歌咏比赛。
I have taken part in a singing competition of our school in the next Tuesday afternoon. Would you please come to see it？
下周二下午学校有一个唱歌比赛，我参加了，请问你有空来看看吗？