Graham gives good advice.
Remember (1) an independent musician or band is a small business, so the product should be what the audience wants and be better than the competition (2) every business is in the customer service business - give them what the want and don't give them any problems. OK sometimes problems happen, if they do, make them glad they had a problem.
The competition is fierce so think about what you can do to be better than your friends and/or competitors. Treat your customers like you would want to be treated if you were in their shoes. It's the only way to do business.
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