Artiste: Imogen Heap

Living in the city is alternately an experience of exhilarating interconnectedness and one of unbearable loneliness. On the good days, you share a sympathetic smile with your fellow commuters on a packed Tube train, you trade easy banter with the cashier at the Sainsbury’s checkout, and you feed off the buzz of the crowd as you head out for a night in Shoreditch.

Raucous cheering and stamping accompanied Eric Whitacre’s entrance and he looked every bit the part of rock star as he charismatically took to the mic to introduce this evening’s concert. Never before, he told us, had he been to a choral concert that made him seriously consider stagediving.

It isn't often you hear six members of the Estonian Television Girls Choir join forces with the Holst Singers and Imogen Heap to perform a live a cappella soundtrack to a 1920s French surrealist film about a libidinous priest. But I am delighted to have seized the opportunity last night, when this bizarre setup hit the Camden Roundhouse as part of this year's genre-baiting Reverb festival.