Going back to musical theatre, most historians will say the real first musical is The Black Crook, which premiered in New York on September 12th, 1866. It was actually a whopping 5 1/2 ours but still it had 474 performances. Usually with musical theatre, or theatre in general it reflects what was going on during the time period. Musical was booming during the 1920's 30's 40's and 60's but since then, people have been seeing that musical theatre, is starting to decline. Now, personally I don't believe so, but with the invention of movies and going to a movie theatre, people would rather go there. But with popular musicals such as Urinetown, they have had great success on Broadway. A great musical theatre performer would be the wonderful Kristin Chenoweth. Actors such as her, have had a great success with musical theatre, and have become very famous for it. This is only dabbing a little into the whole musical theatre, how it is constructed and what makes musical theatre so popular, is just something will have to talk about next time. Since I haven't shown a video just yet, I'd thought I'd post one of the famous Kristin Chenoweth. She is singing the song Glitter and Be Gay. Just click the link and watch, though this video does not really have any dancing in it, but it's great to watch!
A source I used: http://en.wikipedia.org/wiki/Musical_theatre