Collage: A Concerto for Four Horns and Orchestra is a concerto for four horns and orchestra by the American composer James Horner. The piece was commissioned by the Houston Symphony and the International Horn Society and was premiered on March 27, 2015, at the Royal Festival Hall in London. The premiere was conducted by Jaime Martín and performed by the London Philharmonic Orchestra with soloists David Pyatt, John Ryan, James Thatcher, and Richard Watkins. Collage was Horner's last completed concert work before his death in June 2015.