VIDEOS: 'The Sing-Off' Will Convince You to Watch This Season With These Renditions of Classic TV Theme Songs

The Sing-Off knows what sets it apart from other singing competition shows: They're not just singing. They're singing a capella. It's challenging, requires ridiculous amounts of synchronicity and teamwork, and -- when done well -- is flat-out, irresistible fun.

The Sing-Off also knows how to get us TV fans right in our guts, just in time for its new season: A capella renditions of classic TV theme songs!

Check out four classic themes as performed by some familiar faces (and voices) from last year:


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