It's all good fylimar. I appreciate you letting me know how to get proficiency in musical instruments. That IS kinda the point of the thread, though, that I don't currently like how Larian has implemented musical instruments proficiency. I'd like them to simply add it to the backgrounds that D&D 5e already has it included with so that if I want to have a singing, lute-strumming Ranger, I can do that with the Outlander background... or I can create a drum-beating Fighter with the Entertainer background or Far Traveler background (can't even remember if they included Far Traveler in the backgrounds - I don't think they did, but it'd be cool if they added it).
Whatever the case, I think wasting an ASI on my entire party to have a band just so they can sit in the grove and all play together is a little... well... I don't know how else to put it - stupid and a total waste of an ASI. You literally get nothing from Musical Instruments proficiency other than the ability to just have fun playing music at camp or in the goblin camp or the grove or whenever you simply feel like whipping out an instrument and playing a tune. So why penalize players by making them take an ASI - or jumping through some silly hoop with Alfira which makes no sense at all either? Just give players the ability to have musical instruments proficiency included with backgrounds as in the 5e rules already so it isn't some big deal thing.
Or... as Ragnarok mentioned, I think it'd be cool if they just let anyone play an instrument even if you have no proficiency. They could do something simple like make it so that whoever doesn't have proficiency in musical instruments gets Disadvantage on their Performance check. You MIGHT still succeed in playing the violin for an audience of goblins and have them happy with your performance, but if you aren't proficient, you have a MUCH less chance of rolling a 10 or higher, or whatever.