What instrument can an old guy learn if the main goal is to write music?
2 Answers By Expert Tutors
I was a theory/composition major when I went to college. When I applied, I didn't play an instrument at all. They encouraged (made me) learn piano. Piano is the single best instrument to use for composition as it entails all the other instruments. A basic understanding of piano can carry you a long way. Since college I continued playing and have made a very comfortable living touring the world. Also as a composer, the piano had aided me in film scoring and overall production. It allows you the freedom to communicate with other musicians better. Good luck to you!

Kenneth L. answered 03/15/19
PhD in Music Theory and Composition with trumpet as my main instrument
Most composers learn to play the piano because you can play several lines at once. Oftentimes, compositions have several lines going at the same time and being able to play the piano can help you hear those lines.
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Alexa J.
I think guitar would be your best bet to learn later on, as there is a lot of coordination required to play piano. In my opinion, violin is also easier than piano because the bow moves back and forth to the rhythm and switches between 4 strings, and the fingering is typically just one finger, one position, and one string at a time for beginners. You can even learn everything in one key or on open strings to start out. Fiddle music and hymns are a good place to start. The reason why people recommend learning an instrument is so you can learn the difference between half and whole steps in a scale so that it is easier to build chords to lay underneath melodies. You can also create a chord progression to lay a melody over later. The spacing between the fingers helps some people visualize the spacing between notes. However, you can also have someone else do the instrumental part or watch them play to learn about chords. Basic Music Theory or Composition may also be a good place for you to start.06/01/19