If you've got a Windows machine, take a look at uploading your music to Google Play, which is free for up to 20,000 tracks. WMA is supported when uploading from Windows (I think it's then converted for you to mp3). You can then stream to your Nexus 7 wherever you have an internet connection, or tap the 'pin' against tracks or albums that you want to download to the device (as mp3s).
This has the added bonus that your music's then available to all your devices - or even from someone else's if you happen to be round at their house - you just stream via any browser.
Graham
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