Snippet of Madonna's new song leaked online

A clip of pop diva Madonna's new track, reportedly titled 'Rebel Heart', has been leaked online.
About 40 seconds of the dance-meets-acoustic track materialised with Madonna, 56, singing, "I've spent some time as a narcissist, hearing the others say 'look at you, look at you.' Trying to be so provocative, I said, 'Oh yeah, that was me. All the things I did just to be seen,'" can be heard in the leaked snippet, reported Billboard.
Her publicist had no comment about the leak, but the diva's manager, Guy Oseary, tweeted, "I would be grateful to any Madonna fans that can assist us in finding those responsible for the leak. We appreciate your help."

It is assumed the song is titled 'Rebel Heart', as Madonna is heard singing the phrase at one point in the snippet, and because she used the #RebelHeart hashtag on her Instagram for months.
It is unknown if the song clip is from a demo version of the song or a recording of a finished track.
Madonna has been working on new music throughout 2014, frequently updating her Instagram feed with photos and messages regarding her progress. A new album from the entertainer is expected in 2015. It will be her first studio effort since 2012's album 'MDNA', which debuted at number one on the Billboard 200 chart.