Alright sorry for the wait, lets get back to this.
First off, I fixed most of the points you made, except for the parts about the lore of Saleph and Lore Relation. No that Saleph doesn't have its own language, does it still need a history, or can I delete that part? I would like to know this before I add Lore Relation to the backstory.
Second of all, I think I have reached something of a compromise on the subject of the Bowed Instruments skill. I have taken out the violin, and lowered the skill to Basic. However, the other instruments (Rebab, Morin Khuur, and Ehru) are all very similar, in theory. They area ll rather small stringed instruments played upright with a bow. The Rebab and Morin Khuur both have two strings, while the Ehru has one to three. He knows how to play these at a slightly lesser level than the Rebab, but he still can play them well. He's had these instruments for a good portion of his life, and received instruction from Haussam, and they even provided income for him, at one point. Therefore, I believe it is fair to say that he can play all three of these on a basic level, at least, though I would argue that competent makes perfect sense.
Sorry for the delay! It's my first day off since you posted.
No, that section of your back story isn't absolutely vital, but the background of where he's coming from does still require explanation. You've the choice of removing it, summarizing it and placing it somewhere in the back story, or leaving it and adding lore to it.
So far as I know he was with Haussam for a year at most; This isn't really enough time to even be a novice, given music is an artistic skill and treated as a difficult one. That being said, each instrument he plays has to be listed as their own skill. Please also make the other revisions to the skills I asked. With that done your characters skill list comes to 8 skills, at 23. This is the problem. I've asked for the skill to be toned down to one instrument not just because I don't honestly think they're similar enough for him to just get how to play them, but also because your character is too heavy on skills as it is. You must remove other skills entirely for each additional instrument you want him to play. I will send you a PM with some information on how the skills break down in relation to each other to hopefully give you a better idea of how to approach this issue.