The rare promo sold for over £10,000
Trust agreement could see start of unreleased music deals
Prince was also reportedly planning a Missy Elliott duet
The Purple One will be honoured at the awards show<br />
Selection includes live album from his 2007 London concerts
Celebration marks what would have been Prince’s 58th birthday.
The song is available as a free download
The star died in April at his Minneapolis estate
"Used his music to give his views on the po po, politicians, gun control..."
Doctor Fink wanted to see more than just two songs in the performance