I don't know about many of your (the collective "your") diverse formative tuba experiences, but the last time I was seriously trying to play B-flat tuba was probably when I was 17. After that, it was only to play a sousaphone in a marching band or (after that) in NOLA brass bands.
With this instrument, I'm still (fairly diligently, fwiw) working on gobs and gobs of vocalises in various books - pushing myself to perfect my air speed, air speed movement (from one pitch to another, at various volume levels) timing, and buzz frequency precision (as this instrument demands - much more so than these .750" bore piston C instruments...sheesh !)
Sometimes (when reading 32nd notes in vocalises with more than a fist-full of sharps in the key sig', double sharps, and 32nd notes, and executing complicated turns, trills, and what-have-you), I'm pretty proud of myself, but - other times (when my brain gets "messed up" - in 7 sharps...or whatever) I'm reminded of that Three Stooges episode where Shemp was a vocal music teacher (whereby
I'm that middle-aged homely woman - who has no hope of ever becoming a vocalist).
![Image](https://i.imgur.com/kiSi0Fv.png)