Classics released a CD of Matthews' LSO commissions in 1996 to celebrate his 50th birthday. The BBC commission Broken Symmetry was first performed by its dedicatees, the BBC Symphony Orchestra under Oliver Knussen, in March 1992, and repeated at the 1992 Proms. It was recorded in 1994, together with the Fourth Sonata and Suns Dance, by Deutsche Grammophon (a Grammy Award nomination); and it forms the third part of the huge choral/orchestral Renewal, commissioned by the BBC for the 50th anniversary of Radio 3 in September 1996. Renewal received the 1997 Royal Philharmonic Society Award for large-scale composition. The Dutch première of Cortège was given in December 1998 by the Concertgebouw Orchestra under Riccardo Chailly. The ballet score Hidden Variables, incorporating a new orchestral work, Unfolded Order, was commissioned by the Royal Ballet for the reopening of the Royal Opera House in December 1999. Colin Matthews' chamber music includes five string quartets, two oboe quartets, a Divertimento for double string quartet (1982), and a substantial body of piano music. Between 1985 and 1994 he completed six major works for ensemble: Suns Dance for the London Sinfonietta (1985, reworked for the Royal Ballet as Pursuit), Two Part Invention (1987), The Great Journey (1981–88)—re-released on NMC—Contraflow, commissioned by the London Sinfonietta for the 1992 Huddersfield Festival, and two commissions for the Birmingham Contemporary Music Group, Hidden Variables (1989) and ...through the glass (1994), the latter given its first performance under Simon Rattle, who also conducted it in 1998 at the Proms and in Salzburg. Matthews' music was featured at the Almeida Festival in 1988, at the Bath Festival in 1990, at Tanglewood where he has been visiting composer many times since 1988, at the 1998 Suntory Summer Festival in Tokyo, at the 2003 Avanti! Festival in Finland, and the 2004 Berlin Festival. The year 2000 saw four major premières: Two Tributes for the London Sinfonietta; Pluto, an addition to Holst's Planets, for the Hallé Orchestra and Kent Nagano, already widely performed; Aftertones, for the Huddersfield Choral Society; and Continuum, a large-scale work for soprano and ensemble commissioned by the Birmingham Contemporary Music Group for Cynthia Clarey and Simon Rattle, with performances in London, Cologne, Brussels, Amsterdam, Vienna and Birmingham. In the spring of 2001 the Philharmonia orchestra gave the first performance of Matthews' Horn Concerto, with Richard Watkins and Esa-Pekka Salonen. Also in 2001 he was commissioned to write a Fanfare to