If your looking for a site that allows you to play and preview almost any music track you want for free then look no further.

FineTune is an interesting site that allows users to create playlists using tracks from artists they search for and select, or by simply listening to the playlists already created by others. In addition, it will "auto-fill" your playlist with tracks from artists that it thinks you will like if your playlist has less than the standard 45 track size. This feature makes for a good way to hear music from artists that may otherwise never listen to.
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