f-flat harmonic minor 7th chord 6 is d-double-flat major 7th
dom 7th arp major scales in 3rds euphonium 上低音号练习教材选曲
9 relative and parallel scales: major to minor and minor to
【小调指型示范演示】
guitar f# minor third normal 5th no 7th not inverted > f#m
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