Today in Music Theory class we covered arpeggiation. Arpeggiation is when only the consonant notes of the harmonic triad (steps 1, 3, and 5) are played, without the intervening (dissonant) steps on the musical scale. These quantum leaps in pitch cause the tune to jump around a bit, giving it a 'bouncy' feel. Case in point, Fugazi's Arpeggiator. Enjoy.