“Bless god in the dance, dance, dance!” There’s nothing in all of British music quite like Britten’s Rejoice in the Lamb: a deliriously playful prayer, offered up by a half-mad poet and set to choral music of irresistible fantasy and freshness. Thomas Trotter teams up with renowned choral conductor Paul Spicer and his Royal Birmingham Conservatoire Chamber Choir to perform it today, alongside neglected British masterpieces by Stanford and Kenneth Leighton.