like this kind.. http://musclegaintruth.com/ or http://www.spinsuccess.com/index2.php if you scroll down and see the testimonials but instead of testimonials just sample music.. I want cross browser and will not ask for plug-ins .. I have an mp3 sound that needs to be played... please please need your help...
one of the sites the second one uses this service http://instantaudio.com/ the first has an embedded flash mp3 player.. that what you should look for, an mp3 player that you can embed into your site there are plenty of them around. I've used http://musicplayer.sourceforge.net/ in the past and it'll do what you're asking for.
there is software which is very cheap and does it perfectly. do search on ebay for the words: web audio plus resell it's like a buck 99 and works like a charm