I guess (I don't own a Sansa) you have to check whether or how the Fuse supports folders.
You might look at the site www.anythingbutipod.com which is home for forums for Sansa users.
Unlike earlier players I use, my LG doesn't support folders. I ended up having to tag music files for it. I used Tag Tools which allowed a quick and dirty solution but there are many others on offer.
Can anyone tell me how to download music from my computer? (as I already have hundreds of favorites in mp3 format) I would like to have 'folders' that I can name, and then choose whatever I feel like hearing (like an album). . . I tried to do this, and my fuze screen shows all the individual songs, even tho I thought that made, labeled, and downloaded 2-3 folders with 20 or so songs each. WHAT AM I MISSING???

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