Isabella Summers (born 31 October 1980 in Hackney, England), also known as Isabella ‘Machine’ Summers or Isa Machine, is a British songwriter, producer, remixer and member of British indie rock band Florence + The Machine. As well as being the keyboard player for Florence + The Machine, Summers has five co-write credits on the critically acclaimed, BRIT award winning Lungs. Isabella also has three co-writes on the album Ceremonials. She is also a founding member of the band The Life, The Love and The Grateful and is in the progress of co-writing and producing their debut album.

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