What is a pentatonic scale and arpeggios ?? what are it uses

is a scale or musical mode made up of a succession of five different sounds, pitches or notes within an octave. Actually it would be more appropriate to speak of pentatonic scales in the plural, since there are different types

The arpeggio is a way of playing the tones of a chord: instead of playing them simultaneously, they are heard in rapid succession, usually from lowest to highest. When a chord is played in arpeggio, it means that the musician plays the notes of the chord one after the other quickly.

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