Since a CD holds around 800Mb of data, you probably want to compress the audio as an MP3 file to same server resources and the time it would take people to obtain the files. Then just put in a link to the file:
<a href="http:''mydomain.com/cd_audio.mp3">CD Audio</a>
That will allow them to click and play the file or to select the "save file as ..." option and download it to their local drive.