1: Yes. Keyboards, especially synthesizers, most woodwinds, some brass, some guitar, some drums.
2: Keyboards: ex-professional. Woodwinds, ex-student. All others, test-play level.
3: Sing: Yes. Ex-professional, lifelong study and practice.
4: Read music? Yes.
Level, Grade viii piano, basic jazz charts.
5: Compose: Very often. (Monthly.)
6: Dance well? Depends on style and who is playing it.
Don't dance well to classical, or square white music.
Learning music vs. martial arts is very similar, but there are some important differences.
MOST important is that in music you are NEVER told to "do it like this for now", and then have it changed later, as far as basics are concerned.
You learn correct form and function from day one, and it is NEVER changed, only perfected over time.
Martial arts is the opposite.
You are shown things which must be constantly changed to something "more advanced" as years go by, forcing the learning process to begin over, again and again.
Therefore, your latest technique skill-level is often only months old.
I can play a chromatic (every key) scale from the top to the bottom of a full 88-note piano in under 4 seconds.
Any time of day, almost in my sleep.
There is one simple reason: I was taught how at age six, and the "technique" is NEVER changed.
This is why there are so many more musicians than martial artists.
Somehow, centuries ago, the methodology of teaching music was connected to the art of performance in the real world; the methodology of teaching martial arts was either not, or it was lost.
No one could ever learn music by the means that martial arts is taught.