Double Copies of Music in Media

[NorthumberlandA5Cab]

Hi, I recently changed phones. The original had a partial copy of my iTunes on it. When I purchased the new phone, I loaded my entire iTunes library to it, and then connected the phone to the car, a latest version A5 cabriolet with the touch screen. I have now ended up with both music libraries on the car, despite having deleted my old phone. Audi Connect say they don't cover this sort of query, the manual doesn't appear to cover it either and Audi don't appear to have "Genius" experts in their software programs as per BMW. Any ideas on how to delete the double copies of music would be appreciated? Thanks