This is a hard question. In your example. Their first number 1 single.他们的首支最佳单曲

In a number of territories where Chinese is the native language, such as Hong Kong and Taiwan, where the practice of the pop charts is well established, the usual way to say this is: 他们那首歌曲瞬即大热，爬上流行榜首，是他们第一首榜首作品。

他英语得了第一名，并且是他第一次得到第一名。 He got number one in his english and it is his first time to get number one. If you mean what I mean, the answer of your question is 他们的第一次第一名

这首歌迅速走红，并且成为他们的首支排名第一的单曲(唱片)。