He's never been able to read music.

他从来就不识乐谱。

Can you read music?

你能读懂乐谱吗？

Later on I learned how to read music.

后来我学会了识谱。

I wrote a song, but I can't read music.

我写了一首歌，但我不会读谱。

Four years ago, few of them could read music.

四年前，他们中间几乎没人能读懂乐谱。