The Definition of Sound × × Browse the Lessons Trees and Forests (COMING SOON) Pitch & Frequency (COMING SOON) Tuning Systems (COMING SOON) Cents (COMING SOON) The Harmonic Series (COMING SOON) Timbre (COMING SOON) Explore Other Course Categories Music Theory Scales Harmony Rhythm Ear Training Technique Music Styles & Genres Songwriting Rock Riffs & Phrases Improvisation Learn Songs Learn Solos Superstar Results Practice Benefits of Music Study