Abstract: A holder for an MP3 player or other music or communication device is reversibly attached to a rigid helmet such as worn by motorcyclists. The back surface of the holder is configured to fit closely and integrally against the back surface of the helmet. A spoiler forms the top of the holder to minimize wind lift, prevent wind from dislodging the holder, and to direct air flow along the helmet and over the holder. The MP3 player is disposed in a compartment within the body of the holder and retained in the compartment by a stop-tab. An adapter is used to connect the MP3 player to an earphone assembly within the helmet. A volume control on the adapter enables the cyclist to adjust the volume while riding. The holder is reversibly attached to the helmet by means of a two component heavy duty interlock fastener system.