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I think digital artists often begin by sketching their ideas on paper so if they change their mind, it would be a lot easier to mess up the paper instead of the computer. Also, by using paper, digital artists can plan out their ideas and draw it on the computer later.
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It describes the relationship of the lowest notes to the other notes in the chord. For instance, a C-major triad contains the tones C, E, and G; its inversion is determined by which of these tones is the lowest note (or bass note) in the chord. They allow for smoother bass lines and melodies. They give texture and tone to the music. In classical music, different chord inversions have different functions.
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