It's a third-party app, available through Installer.
BTW: The lyrics are synced by users. If the lyrics don't have the karioke-like timing you can add it yourself by tapping the screen right before a particular verse is sung. Then you can sync that data for others (though I don't know if this part actually works).
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Mike
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"Having a smoking section in a restaurant is like having a peeing section in a swimming pool."
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