A Musician's Guide to Practicing With a Drone Tone
Long before tuning apps existed, singers and string players practiced against a drone — a single sustained pitch held underneath everything else — to train their ear for intonation. It's one of the oldest and simplest practice tools in music, and it still works exactly as well against a Web Audio oscillator as it did against a tanpura or a pitch pipe.
What a drone is actually for
A drone gives you a fixed, unmoving reference. Instead of judging a note in isolation — which your ear is not naturally great at — you judge it relative to something constant, which your ear is very good at. Hold a drone at your tonic and sing or play a scale over it, and every note you land on either locks in with the drone (consonance) or clashes against it (dissonance) in a way that's immediately, physically obvious — you'll often feel a beating or shimmering sensation when you're a few cents off, and feel it disappear when you land exactly in tune.
Basic drone exercises
- Unison and octave matching. Set the drone to your instrument's open string or your vocal comfortable pitch, and practice landing exactly on it from above and below, listening for the beating to vanish.
- Scale-against-drone. Keep the drone on the tonic and sing or play each scale degree over it, one at a time, holding each note until it feels stable before moving to the next.
- Interval training. Set the drone to a reference pitch, then try to sing or play a specific interval above it — a third, a fifth, an octave — entirely from memory, and check yourself against the drone afterward.
- Just-intonation listening. Equal temperament is a compromise; a drone lets you hear how a "pure," beatless fifth or third actually sounds compared to the slightly-off equal-tempered version your fretted or keyboard instrument normally gives you.
Choosing a waveform
A pure sine wave is the cleanest reference — no harmonics to distract from the fundamental — and is the best default for pitch-matching exercises. Square and sawtooth waves are harmonically richer and can make certain intervals easier to judge (their overtones will themselves beat against the notes you play), which some players find useful for advanced interval training once the basics feel comfortable on sine.
A note on volume
A drone is meant to sit underneath what you're doing, not compete with it. Start quieter than feels necessary, especially on headphones, and only bring the level up until you can just comfortably hear both the drone and your own instrument or voice at once.
