Part of the BBC Proms.William Blake’s great poem pitting childlike wonder and naivety against adult maturity and experience, Auguries of Innocence, contains the resonant line ‘eternity in an hour’. Eric Whitacre, whose apparently weightless music is often said to stop time, takes that line as the title for his Proms commission, receiving its world premiere at this Late Night Prom. Expect shimmering beauty and heavenly harmonies as Whitacre himself conducts the BBC Singers and an ensemble of strings and percussion. No interval.