Hey so I'm not sure how many people will be uploading their own songs to play, but an idea could be to have music sheets as loot that you find and once you have that discovered you can play the tune on your instrument. This could also lead to different races being able to read their own music so you need a translator. Also you could setup a music player at your house to play a rare song you have found. Food for thought, think it'd be cool to have another collectible item.
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Whoa an actual good idea. And I like how I didn't have to read 5 paragraphs to understand what you thought would be a good addition to the game. WELL DONE!