What are some possible reasons for writing an arrangement? Pick all that apply - adding an introduction - embellishing music so it's more difficult - changing the key so it's easier to sing - combining several songs into one piece, called a medley

All options are applicable.

Explanation:

First of all, it is necessary to specify that the arrangement is a preparation for musical composition and although many believe that it is only performed to beautify the music, make it more attractive to the listener, or even to make it more valuable and difficult. ; the arrangement can be used for several reasons, according to the goals of the musician who is responsible for it. For this reason, we can state that all of the above are applicable.