This guy is seriously rocking the house.

A Swedish sign language interpreter is stealing the Internet’s heart this week with a spirited, smile-inducing performance.

According to this YouTube video, Tommy Krångh interpreted a song performed by singer Magnus Carlsson on "Melodifestivalen," a Swedish singing competition. Krångh’s rousing performance appeared on public service TV station SVT.

If you doubt that Tommy is really the star of the show, ask yourself how much of the actual singer's performance you watched.

I thought so. I don't think I could pick the singer out of a line-up.

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