Adding a single note, at strategic places, will enhance the fullness of the arrangement. For popular music from the 1950s to today, say Carol King or Beyoncé, this will work. Whenever the melody is at rest, add the 3rd or 5th of the chord below the melody, as illustrated above.
This lesson presupposes you understand the meaning of root, third, and fifth of a chord. And, have a basic grasp of intervals. If you struggle with this call me, I can help.
You've got to learn your instrument. Then, you practice, practice, practice. And then, when you finally get up there on the bandstand, forget all that and just wail.
I'm a professional pianist and music educator in West Toronto Ontario. I'm also a devoted percussionist and drum teacher.