Get Microsoft's WMP Version 10
Amplify Your Play™ with Microsoft® Windows Media™ Player 10! Microsoft® Windows Media™ Player 10 offers the best experience for the discovery, download, personalization, and playback of high-quality Windows Media audio and video.

Playing music streams
RealPlayer 8 Basic is free and plays all Real content as well as many other popular web media formats.
RealPlayer plays music and video files. You need the RealPlayer to stream the esquare4u music files.