What is the only time an amateur station is authorized to transmit music?

Amateur radio operators are generally restricted from transmitting music as part of their operations. However, there is a specific circumstance under which this is allowed: when the music is incidental to a retransmission of manned spacecraft communications. This provision is in place to enable amateur radio operators to contribute to the dissemination of manned spacecraft communications, which can involve audio content including music that is relevant to the transmission.

This provision recognizes the unique nature of space communications and provides a means for amateur operators to engage in an activity that supports a broader public interest. The guidelines for amateur radio are designed to promote the sharing of information and collaboration among operators while maintaining the primary purpose of amateur radio, which is not to provide entertainment through music transmission.