Please refer to the following steps to play the MP3 with ITUNES.
Step1: Enable ITUNES Server and Save the setting.
Step2: Enter the IP of NAS-7103/7202 at address bar.
Step3: Map the Network Drive.
Step4: Add a MP3 of NAS-7103/7202 at ITUNES.
Step5: Play the MP3 at ITUNES.
Step6: The version of ITUNES is 10.7.0.21