Grooveshark, a popular music streaming website that closed shop on Friday after losing a longstanding legal battle with record companies, has regrouped at a new site Grooveshark.io, thanks to the proactive efforts of a mystery rogue group whose leader goes by the name of Shark.

"I started backing up all the content on the website when I started suspecting that Grooveshark’s demise was close and my suspicion was confirmed a few days later when they closed," Shark told BGR in an email that announced the arrival of the duplicate website.

At present, the new website has a simple, stripped-down interface but offers access to 90% of the content that was available on the original website.

Shark has revealed that his team is working on getting the remaining 10% and hopes to reproduce the original Grooveshark interface, complete with users' playlists and favourites.

It is unclear whether this mystery group is acting on its own or is sanctioned by the original Grooveshark team.

Legal action against Shark is imminent, but his team have its guards up, BGR reported.

"We have all the servers/domains infrastructure in place, it’s going to be a roller coaster and we’re ready for it," Shark said.