You’re not locked into Rhapsody.
WIndows Media Player works with the Sansa players more or less (often less) the way iTunes works with doPi players.
You need to have WIndows Media Player 10 or above and set the player in Settings/System Settings/USB Mode to MTP.
But that walls you off in the Windows universe. Better to use a media player that works via MSC mode: Media Monkey or WInamp.
http://www.mediamonkey.com/download/
Here are Tapeworm’s how-to’s with Winamp playlists.
http://forums.sandisk.com/t5/Sansa-Fuze/Adding-Playlists/m-p/55917#M40804
The problem with Winamp is that they want you to get the paid version to use it to rip CDs. If you’re just using mp3 files you don’t need the paid version. And to work around that if you are ripping CDs, you can use a free ripper–Windows Media Player, even iTunes–and have it send the files to wherever your WInamp library is, then organize/playlist the ripped files with WInamp.
Media Monkey also wants you to get a paid version to rip .mp3s but they allow a workaround–put the mp3 encoder in the program folder with Media Monkey. It’s called lame_enc.dll and here are instructions on how to get it.
http://audacity.sourceforge.net/help/faq_i18n?s=install&i=lame-mp3
Then you replace the lame_enc.dll that’s in the Media Monkey folder–which times out in 30 days–with this one, which is unlimited.
It’s a little bit of extra time–maybe 5 minutes–intially, but both are good music-library software. Rhapsody…not so much.