Avicii and Killers frontman Brandon Flowers are not the most obvious musical pairing, but an early version of the former's song 'The Days' has appeared online.

Flowers co-wrote the track with the Swedish DJ - real name Tim Bergling - and it was released last year, featuring uncredited vocals by Robbie Williams.

However, an early version of the track with vocals from Flowers has made its way online, and you can hear it below.

Avicii plays Marlay Park with Rudimental on July 3rd and releases his second album 'Stories' later this year.