I just drew a few daily strips about Petey practising the oboe. When Cul de Sac was running in the Post Mag Petey played the trombone. I think he switched because the trombone is too hard to draw. (Try drawing somebody playing a trombone and you'll see what I mean; it always comes out looking like somebody's trying to wear a crutch like a hat) I chose the trombone for Petey because it was so counter-intuitive. Petey's pretty much an introvert and there's no more extroverted instrument than the trombone, it's the most glad-handing of the brass family. But oboes are reasonably funny, and they have that reputation of being the ill wind that nobody blows good.
Below is a sequence from the Post of about 3 years ago when Petey was facing his public trombone debut.