If you're in charge of a big entertainment event, make sure you take into account your audience type as well as your budget, venue, and date. It won't do you much good if you book a borsch-belt comedian for a group of twenty-somethings, or a tractor-pull for an opera crowd.
Musicians can have varying opinions of their own in regards to what they want to play. Make sure when you go to hire a musician that you get one that is going to perform in the style that you prefer and like. Provide them with your music selection and tell them what and how it is to be played.