How might we measure the success criteria of a music promo video?

• Check how many views it got on YouTube 
• Sales of CD's/Downloads 
• Charts
• How much money it made
• Reviews in newspaper and articles 
• Amount of publicity
• Most viewing of music video now appears to be online
• VMA Awards/ MTV awards

Before people had to wait for there music on TV and may never used to come on but now with the help of the internet people can just go online and search for and find it, so bringing the rating of the music up.