Dave Brubeck recorded this album in 2005 with his regular quartet, including Bobby Militello, Michael Moore, and Randy Jones. The title refers to musical notes (flat and sharp) and the city of London, where the recording took place.
The album includes original compositions by Brubeck and covers of standards, showcasing his characteristic jazz style with classical influences. It was released in 2006 by Telarc, receiving positive reviews for the quartet's energy and creativity.
This album was one of Brubeck's last studio works before his death in 2012. It stands out for the interaction between musicians and the exploration of complex rhythms, maintaining the freshness that defined his career.