A release date is yet to be set for the track responding to civil unrest throughout the US city
One message read: 'All I do is use people to get what I want'
Festival organiser disputes "unfounded and completely untrue" reports
The Purple One allegedly sued for interfering in singer's recording contract
The pop frontman is currently playing his 'Hit and Run' shows Stateside
Michael Jordan, Jay Z, Beyoncé and Queen Latifah all in attendance
Private gig was in support of Autism Rocks Charity
Track taken from the album 'Plectrumelectrum'
Duo beat competition from Lorde, Patti Smith, Sia and Lana Del Rey
The track features on Prince's recent album 'PLECTRUMELECTRUM', released in September