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Interval singing is the ability to produce a specified interval on demand given a starting pitch. This is the productive counterpart to interval recognition: recognition is passive (hearing and naming), while singing is active (producing the sound). Skills include singing intervals both up and down from a given pitch, arpeggiation through chords, and maintaining accurate intonation. Connecting interval quality to solfège syllables (e.g., do to mi is a major 3rd) bridges the gap between notation and sound.
Begin with perfect intervals (octave, fifth, fourth) which have the most distinctive sound profiles. Use a drone or reference pitch and sing each interval above and below it. Record yourself and evaluate intonation.
You can already recognize intervals by ear — hearing a major third, a perfect fifth, or a tritone and naming it. Interval singing is the productive counterpart: instead of passively receiving a sound and identifying it, you must generate the sound from a given starting pitch. These feel like the same skill, but they engage your musical thinking in opposite directions. Recognition starts from sound and ends at a label; singing starts from a label and ends at sound. The gap between them is real and requires dedicated practice to close.
The most reliable bridge is solfège. If you know that do to mi is a major third, you can sing a major third above any pitch by internally imagining do and then reaching up to mi. The solfège system converts interval names into felt relationships within the scale, which your voice can then reproduce. Start with the most distinctive intervals: the perfect octave (do up to do) and the perfect fifth (do up to sol) are the easiest because they have the most resonant, "locked-in" sound — you can feel when they are in tune. The perfect fourth (do to fa) and major third (do to mi) follow naturally. Leave the tritone (do to fi), minor second, and major seventh for later; they require a fine-tuned sense of intonation to produce consistently.
For each interval, develop a reference melody: a song whose opening leap matches that interval. A major sixth? The opening of "My Bonnie Lies Over the Ocean." A minor third down? "Hey Joe" by Hendrix. These are not crutches — they are anchors. Your brain maps the felt interval to a kinesthetic and melodic memory, which makes it reproducible. Over time, the reference fades and the interval becomes directly accessible, but the reference gets you there faster in the early stages of training.
Intonation is the discipline that separates interval singing from interval guessing. Record yourself producing each interval and compare against a drone or keyboard reference. Small tuning errors — singing a major third slightly flat — compound when you chain intervals together into a melody. Arpeggiation is a useful diagnostic: sing the two notes of the interval separately, then fill in the implied chord tones, then return to the interval. If the chord tones are in tune but the interval still sounds off, you are likely placing the top note in the wrong octave or misidentifying the interval. Correction comes from slowing down and targeting the precise pitch, not from repetition at speed.
Practice both ascending and descending versions of every interval. A perfect fifth up from C is G; a perfect fifth down from C is F. These require different muscular sensations and different solfège mappings (do-sol versus do-fa in the octave below), so they are genuinely distinct skills. The ability to produce any interval in either direction, from any starting pitch, at a comfortable tempo, is the foundation for sight-singing — reading a notated melody and producing it accurately on the first attempt. Interval singing is the atomic skill; sight-singing is its application to continuous melodic lines.
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