This document defines the audio and music data transmission protocol as an instance of a real-time data transmission protocol to be standardized under IEC 61883-1/FDIS in the future. The audio and music data transmission protocol (hereafter referred to as the A/M protocol) can be applied to all modules or devices which have any kind of audio and/or music data processing, generation and conversion function blocks. This specification deals only with the transmission of audio and music data; the control, status and machine readable description of these modules or devices should be defined outside of this specification according to each application area. All modules or devices which implement this A/M protocol should have the capability of "arbitrated short bus reset" defined in IEEE P1394a in order to prevent the interruption of audio and music data transmission when a bus reset occurs.