Powell coached all of the record label's young stars, including The Supremes and Marvin Gaye
The 250-capacity Water Rats venue in Kings Cross will re-open on Friday (October 18)
The star of 'The Office' performed a ten-track set with a backing band including former Razorlight drummer Andy Burrows
The founding member of the 80s glam metal band loses her battle with cancer
The concerts will take place in Brighton, London, Manchester and Edinburgh