Wikipedia
Quote:
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The Media Transfer Protocol (MTP) is an extension to the Picture Transfer Protocol (PTP) communications protocol that allows media files to be transferred automatically to and from portable devices. Whereas PTP was designed for downloading photographs from digital cameras, Media Transfer Protocol allows the transfer of music files on digital audio players and media files on portable media players, as well as personal information on personal digital assistants. MTP is a key part of WMDRM10-PD, a digital rights management (DRM) service for the Windows Media platform. In 2011, it became the standard method to transfer files from/to Android
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https://en.wikipedia.org/wiki/Media_Transfer_Protocol
It's interesting, for a given degree of interesting and obviously MS (windows) and Google (Android) have a vested interest in gadgets using MTP and not USB Mass Storage.
Direct access is also difficult with Apple iOS. It adds extra levels of walled garden where the Apple player can only see mp3 transferred by Apple software (e.g. iTunes on Win7) and only 3rd party players can see mp3s transferred without the Apple ecosystem.
USB mass Storage based gadgets implement OS and application security by only sharing a particular partition or subdirectory.