Honestly, not sure how many instruments Ben can play at least passingly well—probably four but maybe eight, plus "aux" (auxiliary percussion). He became the youngest member of the long-running Ballard Sedentary Sousa Band for a couple seasons; the oldest member was 95—a mere 80 years difference in their ages.
Ben is now a music education major at Boston U, and he'd improved his piano playing over years and due to mandatory courses, after just a term, has stepped way up.