Billboard is going to have two charts with data from Eventful, an events website that tracks demand for specific artists and concerts. The two are "Eventful Hottest Demand" and the "Eventful Weekly Most in Demand."

While there is most certainly a correlation between Eventful-measured demand and actual attendance, I think it's a bit weird to create a hypothetical chart. One issue facing a touring industry that wants to sell more tickets is there are only seven days in a week -- and average people prefer to go out on only two of them. (I say "average" because people in cities like New York go out five or six nights a week and think nothing of it. Even Sunday shows by third-rate bands can get a good crowd in New York.) Eventful might as well offer different qualifications to its "Play My Town" feedback: only on a Friday night, only at an all-ages club, only if the weather is good, only if parking isn't a problem, only if I don't have an important meeting at 8am the next morning, only if the entire ticket price is under $20.

A few more telling chart would be one that shows the "Eventful spread," the difference between those who urged an artist to "Play my town" and those who actually bought a ticket and showed up. That would capture the flake factor of the artist's fans and indicate what percent of demand had actually been realized. For digital start-ups like Eventful and iLike, services that provide fans customized information on concerts in their areas, this would be a constructive way to gauge success in motivating people to get out and see live shows.