It's more enjoyable to keep doing the things you do well than to work on things you don't do so well. Recently I fell for an online course that promises to teach you how to memorize music easily and keep them stored in memory "forever" (when one is eighty years old, as I am, "forever" is not all that long). Not to worry, the cost of the course is less than a good dinner for two in a restaurant. Difficulties with memory are common as one ages, so maybe working on memorizing music will stave off general memory loss. Recently I read an interview with the brilliant Canadian pianist, Angela Hewitt, who, without false modesty, described her own memory as prodigious, about finding her memory a bit less prodigious than it once was, and dealing with that development.
I'm not good at memorizing. For several months, on and off, I've been playing the bossa nova song, "Chega de Saudade," and trying unsuccessfully to memorize it. There are other songs that I once had by memory but have forgotten. For example, I often get stuck on the bridges of jazz standards, and I have found it impossible to memorize any of Bach's unaccompanied suite for flute. This is frustrating, and I'm hoping that the online course will help me overcome this weakness. I also hope that I'll be able to memorize the chords that accompany the melodies - the changes. That will help me improvise, another musical skill that I should improve.
This evening, for the first time, I started using the course, and I found the insights it offers into the process of memorization both intelligent and useful. Meanwhile, addressing the memorization weakness has led me to notice another big weakness in my musicianship, which is identifying intervals. I devised a little exercise to help me with that. Starting on any note, I played each interval going up: minor second, second, minor third, third, perfect fourth, augmented fourth, perfect fifth, etc. As I played I tried to anticipate the intervals in my mind's ear. When I got to the octave, I started doing the same thing, but going down. I found that a lot harder.
It's been easy for me to avoid dealing with these two weaknesses in my playing by being a fairly proficient reader, and I often spend practice sessions reading music. That helps me play the music with other people, but it doesn't help me overcome the two weaknesses I've mentioned. It does, of course, help with other weaknesses, such as intonation, rhythm, tone quality, and general mastery of one's instrument.
Importantly, musical weaknesses are not technical. They are cognitive. The lessons one learns in addressing weaknesses in one area of one's life ought to carry over into the rest of one's life. Let's hope.