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

We can keep up to date with how well a music promotion video is doing though many ways such as:

1. How many views a video has on You Tube.
2. Through music channel requests
3. By sales such as CDs and charts.
4. By the word of mouth
5. Newspaper articles/ TV results
6. How many times a video is shown on television
7. Amount of publicity it gets
8. And finally Illegal/Legal downloads