(scene opens in cluttered parlor)

Beta: (warbling scales on baritone)
Me: (not looking up from embroidery frame) That second to last note is wrong.
Beta: (hotly) No its not.
Me: It is. Play it again.
Beta: (warbles, second to last note wrong) I didn’t hear anything wrong.
Me: What valve are you pushing? (looks up) Try pushing the middle one.
Beta: (plays scale through three times, none keeping the same octave all the way through)
Me: I’m waiting.
Beta: (wails) Mom! I’m playing it right! The teacher told me this is the fingering! Its just how my baritone plays!
Me: (sighs, gets up from couch, pulls up fingering chart for Bass Clef on laptop) Oh look. That’s the note you’re trying to play? (points to note) Looks like it’s middle valve.
Beta: (sullen, plays scale, all notes correct, stares at mother)
Me: Seriously. “This is just how my baritone plays?” You actually thought I’d fall for that? Remember this next time I’m not taking you seriously.
Beta: (goes back to playing scales with less warble)