"Sanssouci" is a song written by Rufus Wainwright; appearing as a track on his fifth studio album, Release the Stars (2007). The name is a reference to the Sanssouci palace built by Frederick the Great in Potsdam, Germany. The studio recording of the song used in Release the Stars includes both Wainwright's sister, Lucy Wainwright Roche, and his long-term friend singer-songwriter Teddy Thompson, on backing vocals. Originally a French term, the expression "sans souci" translated into English means roughly "without worry", "without cares", or "carefree".

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