Songr

Songr is a cloud music player that streams and downloads music from multiple web services, including Grooveshark, Prostopleer, MusicSearch, YouTube and many others (including the music already on your computer)
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Windows XP/Vista/7/8, freeware, 5 MB
Portable version
Note: Songr does not index nor host any mp3 files, it's just a desktop interface to third party mp3 search engines. Songr has no control over any web sites or resources which are provided by companies or persons other than Songr.