Greenberg's body was discovered in his bed by his girlfriend Abby Mayer at their shared home in Florida on Sunday evening.

His mother Lori tells the Gainesville Sun the medical examiner found no explanation for a cause of death from the autopsy, and toxicology reports will take two to three months.

Local police said there was "no evidence of foul play or suicide".

Greenberg founded Grooveshark in 2006 with Sam Tarantino. They were forced to shut down the service in May (15) as part of the court settlement of an $11 billion copyright infringement lawsuit.