You need the right "plug-in for this! There are quite a few available. The most popular for music are RealPlayer and Crescendo. However there are others available.Check out this website .
I am sure it has what you need!
I am running Netscape 7.1 I have music on my web pages that I cannot hear (mid files) when using Netscape....however IE will play them...is there some setting change I need to make in Netscape so that I can hear these sound files on the web pages?