Step 1: Get Music Saver from Here
Step 2: Music Saver will appear near to the address bar / URL textbox
Step 3: Visit site which you would like to download audio from
Step 4: Right Click over the audio and a menu will show up
Step 5: Select Music Saver icon
Step 6 : A pop-up window with list of audio will show up
Step 7 : Click over the title of the audio and Save file window will appears, Click Save from it.