Isabella Janet Florentina Summers (born 31 October 1980) is an English musician, songwriter, producer, remixer and member of English indie rock band Florence and the Machine. As well as being the keyboard player for the group, Summers has five co-writing credits on the critically acclaimed, BRIT Award-winning Lungs. and three on the album Ceremonials. She has three songs on the new How Big How Blue LP, "Delilah", "How Big, How Blue' and "Which Witch", including two productions on the deluxe version.
When not on tour with Florence and the Machine, Summers writes, produces and remixes tracks for artists including Iggy Azalea, Ella Henderson, Flux Pavillion, Maxine Ashley, Rita Ora, Judith Hill, and The Game.