Beethoven's compositional output is frequently categorized into three different periods: Early, Middle, and Late. Each period corresponds chronologically with his life, and each period also features distinct musical qualities that set it apart from his other compositional periods.
Because they all have different densities. If you have milk and peanut butter in different bowls the milk will be a lot easier to get off than peanut butter because of the density dofference. Does this help at all?
Do they have to be covered by english people or by a singer from a different country?
When you are publically speaking for debate team, motivational speaker, or just having a speech