Pitch pipe & pianoPitch pipe & pianoPitch−Original key+Pitch pipeOctave2345C4C♯4D4E♭4E4F4F♯4G4A♭4A4B♭4B4Piano keyboardC3–C6C3C♯DE♭EFF♯GA♭AB♭BC4C♯DE♭EFF♯GA♭AB♭BC5C♯DE♭EFF♯GA♭AB♭BC6