It took me a long time, to decide what Old's main instrument was going to be.
This image has her playing the flute, and while Old is a master of every musical instrument ever conceived, her chosen/favorite instrument is the underrated trombone. (I played trombone well into my high school orchestra level, and it has always been my favorite instrument!)

Unfortunately, I do not remember who did this work. It was a birthday gift (from years ago) gotten for me by my good friend and I believe she used her monthly patreon sketch slots, that the artist in question offered her, for paying into his patreon. I'm sure if you're really really curious, can point you in this artist's direction! I am very sorry I cannot tell more. D:

oldmusic is © Oldmusic. She's MY namesake character! lol
artwork © the incredibly talented artist from like, 3+ years ago.