Well many of us watch videos on youtube.You loved the song but dont want an video.Dont worry just follow the below steps and you are doneGoto 
http://www.vidtomp3.com

Copy the FULL address of the page with the video.

Paste the address you copied into the text box below.
Click "Download", and wait. Please be patient.
When conversion is complete, click on "Download MP3".
You have Downloaded the MP3 version.