Jazz is there and gone. It happens. You have to be present for it. That simple.
When I joined the band I didn't know any of the tunes, and when I left the band I didn't know any of the tunes!
Jazz is one of the least learnable art forms.
If I'm not a jazz player all the time, I've at least been cued in to what I do by jazz.
If music is sound & came from silence, then silence is potentially greater than sound.