From the description on the YouTube page:

An unofficial but big hearted video for the Hey Rosetta! song, There’s An Arc, from their album, into your lungs (and around in your heart and on through your blood).

Shot over a few hours on a winter Sunday at Tim’s house, the band plays the song live in one unbroken take.

Pretty beautiful:

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I can’t watch this without smiling and bobbing my head.
I have just discovered The Kooks