Name this English composer of The Young  Person's Guide to the Orchestra.
Arvo Pärt ["pair"t] composed a cantus in memory of this man, who used the song "Come, Heavy   Sleep" as the basis of his guitar piece Nocturnal after John Dowland. Pan, Phaeton, and Narcissus  are three of the parts of his solo oboe piece Six Metamorphoses after Ovid. This composer adapted a   theme from Henry Purcell's Abdelazar  for a work that was commissioned to be part of an educational  documentary demonstrating the abilities of various instruments. This composer also wrote an opera  about a fisherman accused of murder, Peter Grimes. Name this English composer of The Young  Person's Guide to the Orchestra.
Arvo Pärt ["pair"t] composed a cantus in memory of this man, who used the song "
(Edward) Benjamin Britten