Harlequin was commissioned by, and is dedicated to, euphonium virtuoso David Childs for a CD recording in 2004. He gave the first live performance at the Gala Concert following the first All England Masters International Championship on 29th March 2005, accompanied by the BAYV Band, conducted by his father, Robert Childs.

The piece takes as its inspiration the happy and sad masks which symbolise the Commedia dell’Arte (which features Harlequin as one of its main characters) and comprises two movements, a slow modal ballad followed by a frenetic faster movement