4D Music Player is a free music and radio app developed by 4D Creatives Inc. It is available on the iPhone platform and has gained popularity in several countries, including Taiwan, Hong Kong, Ukraine, Slovenia, Canada, the United States, and Mainland China.

With 4D Music Player, users can enjoy a wide range of features. One of the standout features is the 4D Music on Demand service, which allows users to request tracks and enjoy high-quality performances by world-class pianists. The app also offers the ability to add and import tracks to a playlist, as well as change the speed and transposition of the playback instantly.

Flexibility is a key aspect of 4D Music Player. Users can pause and jump ahead in tracks, listen back to a chord being detected in real-time, and bookmark favorite speeds and spots. The app seamlessly switches between harpsichord, guitar, organ, and piano sounds, providing a diverse musical experience.

Additionally, 4D Music Player offers the option to stream via FaceTime Share My Screen in a group call, making it easy to share the music with friends and family. For unlimited usage, users can subscribe to flexible plans, including weekly, monthly, and yearly options.

It's important to note that the app includes a subscription model. Payment will be charged to the user's iTunes Account, and subscriptions automatically renew unless turned off at least 24 hours before the end of the current period. Subscriptions can be managed through the user's Account Settings.

Overall, 4D Music Player is a feature-rich music app that offers a variety of options for music lovers. Whether you want to enjoy high-quality performances, customize playback settings, or share music with others, this app has you covered.