Original: He was a champion of contemporary , mostly British , composers . Commissions and First Performances were established in the 1950s and 1960s and included works by Stravinsky ( Canticum Sacrum , guest conducted by Robert Craft , in 1956 ) , Bruno Maderna , Luigi Dallapiccola , Peter Maxwell Davies , John Tavener , Anthony Milner , Stanley Glasser ( sung in Zulu ) , Christopher Brown , Geoffrey Burgon and his own pupil Nicholas Maw .
Simplified: He conducted music by many Baroque composers as well as modern composers such as Igor Stravinsky , Peter Maxwell Davies , John Tavener , Stanley Glasser ( sung in Zulu ) and his own pupil Nicholas Maw .