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music flat musical note flat symbol notation pitch tone key signature scale chord melody harmony treble clef staff notation music theory piano guitar violin keyboard music sign lowered note sound frequency tuning composition sheet music melody note flat key signature symbol musical scale chromatic scale musical notation music lesson music education musical pitch note alteration diatonic scale musical key note lowering audio note instrumental music notation symbol melodic note music symbol classical music note flat tone adjustment sound note flat musical training instrumental practice pitch adjustment flat key music symbol notation lesson music learning music composition theory practice