Answer:
Two reasons why writers would choose to use trochaic tetrameter are to contrast with the type of verse they usually use and because it is a rapid meter method.
Explanation:
Trochaic tetrameter is a very common meter in plays (next to the Iambic Trimeter). It is a fast and sophisticated method. It's just that admits such variations that this sophistication is not evident.
It consists of four trochaic meters, primarily of two linked joins: BAboom / BAboom / BAboom / BAboom.
But most of the time the first brief of each meter can be replaced by a long one, and also the long ones by two short ones, including the last one mentioned. Only the second brief of the meter cannot be changed, which remains as well as the main metric reference. So we can find the nine possible configurations, although the first two are the most frequent.
Answer: Because they want the verse to sound like a nursery rhyme, to be really catchy and memorable, or they want the reader to read at a "bouncy" pace.
