STEP 1 : Go to the following site:
http://www.tubeminator.com/
STEP 2: Put your desired video file link in the box and press start. A box will be appeared at the bottom where video will be converting.You will see a progress bar.
STEP 3 : After converting ,just select the download format such as mp3 and wait for a while.Your download manager manger will grab the download link.So simple!!!
Note: It is better to use Internet Download manager to grabbing download links.Thanks!!