Metcalfe's string arrangements played by the Dukes feature on many albums by pop artists including Morrissey, Simple Minds, The Pretenders, Coldplay and Blur.
The Appearance of Colour was released in April 2013 as part of Bowers and Wilkins Society of Sound subscription series.
[3] Commissions include a set of pieces for the guitarist Tom Kerstens and an album of electronic/acoustic music for 'cellist Matthew Barley.
He also collaborated with Peter Gabriel, writing arrangements for his "song-swap" album, Scratch My Back, and for the tour following it.
In 2015, Metcalfe released a solo album titled Kites and Echos on Bowers & Wilkins Society of Sound and The Appearance of Colour on Real World Records.