guys i actually highly recommend putting music onto your 3ds using ftpd. i added a ton of vocaloid and hamilton music to my 3ds and its really fun!! i used a spotify downloader and winspc to do it, and a tutorial on youtube lmao have fun!!!
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Just remember to include song metadata like author, title, album, year, etc. for StreetPass playlist. Really though, I recommend against using 3DS Sound as it regularly misidentifies song length, so you get huge gaps. It's a charming player though :<