Florence + the Machine are working on a dance music side project.

The indie band - fronted by singer Florence Welch - have secretly been making ''weird'' dance records in their spare time, but she is unsure if it will be released.

She told DigitalSpy.com: ''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.''

Florence also said she was pleased with DJ Calvin Harris' remix of their recent single 'Spectrum' as it had caught the perfect balance between happy and sad which she is looking for.

She added: ''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.''