If you do hear sound but its very low, right click on your speaker in your taskbar in Windows, then go to the volume mixer. If the music is playing then you should see you're browser playing the music, adjust it to your liking (max it in your case I guess).
Best solution would be to download the tunes to your harddrive and use VLC's playlist to play the music. That is the simplest way but look at the copyright for course