An Internet interactive music station (IMS) is presented. The IMS system is a personal audio multicast transmission system and provides an interactive environment over the Internet. The IMS server site plays the DJ role and can multicast the DJ's voice and MP3 music to multiple clients. The IMS client site plays the audience role and can receive audio and MP3 music from the IMS server. Additionally, the IMS provides two features using the real time multimedia interaction technique. The first one is that the IMS audience can transmit his voice to the IMS server with a call-in operation. The second one is that the IMS offers the dual server mode to allow a secondary DJ, who is geographically separated from the main DJ, to join the program. That is, two geographically separated DJs cooperatively control the program. Related technical issues and the corresponding system development of the IMS are presented in detail.