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It is not signed by Chopin, but the handwriting includes his distinctive bass clef.

How about Grizzly Bears Don’t Fly Airplanes for the lines of the bass clef, or Empty Garbage Before Dad Flips or Elephants Get Big Dirty Feet for the lines of the treble clef?

They might call a note "middle C" or "second line G" or "the F sharp in the bass clef."

It was the territorial line between where the right hand and the left hand traveled, between the treble and the bass clefs.

While I’d been playing brass instruments for years, tuba parts are written in bass clef; I’d only ever read treble clef.