Theatrical entertainment is shows like Broadway and stadium rock; visual entertainment is the stuff we like to look at, including art; audio entertainment is music and sounds. Entertaiment has its roots in the word entretenir, which means to hold together or support. It was also associated with hospitality: entertaining guests at a party or feast was seen as an act of service. In modern times, it is about amusement and distraction. The clown at a birthday party, the juggler on a street corner, your friends fighting over the last potato chip: these are all forms of entertainment.
When writing an article about entertainers, it is best to get a biography from an authorized source rather than an unpublished account. Authorized biographies are usually more accurate than unauthorized accounts, and they will help you find the right angle for your story.