Beyoncé has given new music-streaming service Tidal a boost at its launch by releasing a fresh track exclusively on it.

The R&B star part-owns the network, along with hubby Jay-Z and stars such as Madonna, Rihanna and Calvin Harris.

Die With You. Watch the full video on TIDAL.com

Posted by Beyoncé on Saturday, 4 April 2015

The stripped-back song sees Queen Bey tinkling the ivories and singing while dressed down in a T-shirt and backwards cap.

Thought to be a celebration of her and Jay's seven-year marriage, the video is revealed at the end to have been shot by Jigga himself.

She posted a snippet of the track and a link to Tidal on her Facebook page.