Arpeggios for the Evolving Guitarist (USC) Book/CD Set, by Pat Kelley. Arpeggios are chord notes played one at a time rather than strummed or plucked all together. They are an essential part of great improvising and melody writing because playing chord notes in the right places creates solid melody lines. Chord notes sound more resolved than notes that are chromatic (out of the key).Practicing arpeggios will improve your ability to learn melodies, make reading music easier, and develop your tone