The collective said that they have set up a dance outfit called Side Project and have recorded a number of house tracks.
Florence Welch told Digital Spy at Radio 1's Hackney Weekend: "We actually have a dance outfit side project called Side Project. We made this weird house track that sounded quite churchy - to be confirmed! As yet it has never seen the light of day."
Discussing Calvin Harris, who has reworked her latest single 'Spectrum', she admitted: "I'm such a huge fan of his. What I enjoy about Calvin's songs is that he has that blend of euphoric and melancholic which as an artist he has managed to perfect.
"It's that mix of catchy and sad - that feeling of complete joy but something tugging at your insides. That's what makes a great pop song and I really think he's coined that."
Florence + the Machine recently unveiled the music video for their latest single 'Spectrum', which was directed by David La Chapelle.
Listen to the Calvin Harris remix of 'Spectrum' below: