Keane's Surprise for Electric Proms

Keane had a few tricks to entertain the crowd at London's Koko last night that included strings, saxophonists and a choir.

The band showcased several songs from their new album as well as reworking some of their biggest hits from Hopes and Fears and Under The Iron Sea.

The crowd showed their appreciation with loud cheers and sing-a-longs to many of the hits from their debut album including Everybody's Changing and Somewhere Only We Know, but most fans pointed to special collaborations on their newest tracks as the high point.

Talking to BBC 6 Music afterwards, Tom said "There are a lot of things on the new record you can't replicate with just the four of you," adding "So it was a great way of being able to indulge ourselves and have that for one night."

Pianist and keyboard player Tim Rice-Oxley told 6 Music after the gig, "You have an idea and you think of getting a few violins, and the next thing you know you've got thirty people running around on stage," adding "It's nice when things snowball like that."

New single Spiralling was buffeted by two saxophonists while the string quartet was used to give extra body and clarity to Love Is The End, which singer Tom Chaplin said he felt summed up the theme of their newest work - love.

The set alternated between old and new tracks, with the musical arrangement changing frequently - Tom played guitar on most of the newer tracks with Jesse on bass, while older numbers gave Tom the chance to play piano while Jesse played backing synths. But the band waited until the three song encore to unveil the choir - which sang on Perfect Symmetry.

The quartet stuck with the habit of finishing the set with Bedshaped, which closed to rapturous applause. Keane's next one-off gig is the Little Noise Sessions at London's Union Chapel on 15th November, which the band played at last year.