After years of using various iPhones with Kenwood receivers in my vehicles I recently bought a Galaxy S6 and in no way could I get to be recognized via USB by the head unit. After trying everything suggested online and by phone the answer was so head slapping simple...bought a male to male 3.5mm aux cable plugged into head unit then into Galaxy and shazaam! It plays flawlessly. I don't need Kenwood's Music Play app or any other app. I just bring up the stock music app on the phone and away it goes. Don't know if anyone else has posted this on these threads but if it helps anyone else avoid a head full of grey hair then I consider my job done! Good Luck and let the music move you!