In tonal Western classical music (music with a tonic key or "home key"), the most frequently encountered chords are triads, so called because they consist of three distinct notes: the root note, and intervals of a third and a fifth above the root note. ... A series of chords is called a chord progression
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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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An acid-resistant substance called GROUND.
Next the plate is dipped in ACID.
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