As a musician 作为音乐人

Yesterday,a friend who known in twitter sent me an E-mail,I have ever sent him a guitar score arranged by me,he said he uploaded this song's video on youtube.
He doesn't play not very well though,but as an arranger,I very glad to that other people play my song.and as a musician,I also must compose and arrange new song.

昨天，有一个在推特上认识的朋友发给我了条一封电邮，我以前给他发过一个我自己编曲的乐谱，他说他把那首歌的视频上给youtube上了

昨天，有一个在推特上认识的朋友发给了我一封电邮，他说他把一首歌的视频传上了youtube，我突然想起，之前我给他发过一个我自己编曲的乐谱。
虽然他弹的不是很好，但是作为一个编曲者，我真的很高兴听到别人弹我创作的或编曲的乐谱。我要继续创作和编曲。

语法没有问题，不过最好是先说电邮说了些什么，再解释。（只是我自己的看法。）

写的已经很好了！

As a musician 作为音乐人

Yesterday, a friend who I've known on twitter sent me an E-mail. I have ever sent him a guitar score arranged by me. He said he uploaded this song's video on youtube.
He doesn't play not very well though, but as an arranger, I'm very glad to that other people are playing my songs. And as a musician, I also must compose and arrange new songs.

昨天，有一个在推特上认识的朋友发给我一条电邮，我以前给他发过一个我自己编曲的乐谱，他说他把那首歌的视频上给youtube上了
。虽然他弹的不是很好，但是作为一个编曲者，我真的很高兴听别人弹我创作的或编曲的。我要继续创作和编曲。