Offtopic: Yesterday there was an overdose of Windows programs. Today, it's the revenge of the online applications. :P
Songza

If you like the simplicity of Google, then Songza is the perfect music search engine for you. With a simple and uncluttered interface, Songza relies on YouTube to get you the songs you desire. Unlike Google however, Songza is jazzed up with AJAX and Web 2.0 effects. You'll be able to enjoy seamless inline page loads and cool fade in/out animations while searching for your favorite music. One of the strengths of Songza is also its main weakness - its dependence on YouTube means not every song can be found, although Youtube's vast catalog of music videos more than makes up for it.
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