If there's no DOWNLOAD link you can use this :
DownLoadHelper : https://addons.mozilla.org/en-US/firefox/addon/3006
for Mozilla FireFox: http://www.mozilla.com

When you install this addon for FireFox and when you open a page of some song , 3 colourful balls will appear and start moving next to your addressbar of Firefox, when you click one them you'll download the mp3.