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Scale degrees have characteristic qualities of stability or instability — tendencies to move toward or away from other scale degrees. Scale degree 7 (ti) has a strong upward tendency toward 1 (do), and scale degree 4 (fa) pulls downward toward 3 (mi); these are called tendency tones. Scale degree 1 is the most stable (tonic), while 2, 4, 6, and 7 are relatively unstable and tend toward resolution. Internalizing these tendencies allows musicians to anticipate melodic motion and hear harmonic progressions more clearly.
Sing each scale degree and then let it 'resolve' naturally — notice where your voice wants to go. Play a melody and pause on an unstable scale degree, feeling the tension before resolving it.
From your work with movable-do solfège, you can already sing a major scale and name each note: do, re, mi, fa, sol, la, ti, do. You know these as positions in a pattern. But scale degrees are not just labels — they carry gravitational charge. Some scale degrees feel like rest; others feel like motion waiting to happen. This is what tonal gravity means: within a key, certain notes are stable resting points and others are unstable, pulled toward resolution like a ball on an inclined surface. Hearing these tendencies is one of the most powerful skills you can develop, because it lets you anticipate where a melody is going before it arrives.
The anchor of the entire system is scale degree 1 (do), the tonic. It is home. Any melody that lands on do feels settled, complete. Scale degree 5 (sol) is also quite stable — it is the fifth of the tonic chord and sounds nearly as resolved as do itself. Degrees 1, 3, and 5 together form the tonic triad, and any melody note that belongs to this triad lands with some sense of rest. The other scale degrees — 2, 4, 6, and 7 — are the unstable ones, and they pull toward their nearest stable neighbors. This is not a metaphor: if you sing "ti" (scale degree 7) and then stop, you will feel physical discomfort, a strong internal pressure to continue upward to "do." Try it. The tension is real.
The two most important tendency tones are scale degree 7 (ti) and scale degree 4 (fa). Ti has a half-step distance from do above it — just one semitone. That closeness is precisely why the pull is so strong. In tonal music, ti almost always resolves upward to do. This is the leading tone, and it is the note that gives dominant chords their forward momentum: the V chord (sol-ti-re) contains ti, and that single note creates much of the urgency you hear in a dominant harmony. Fa (scale degree 4) pulls downward by a half step to mi (scale degree 3). Together, ti and fa are the two notes of the tritone that forms inside the dominant seventh chord — and their opposing tendency tones (ti up, fa down) explain why the V7 chord resolves with such force.
For ear training, you develop this skill by singing scale degrees deliberately and pausing on the unstable ones. Sing do-re-mi-fa and stop. Feel fa pulling toward mi. Now resolve it. Sing do-ti and stop. Feel ti pulling up. Resolve to do. Over time, this becomes automatic — when you hear a note land on ti in a melody, something in your ear leans forward in anticipation of resolution. This is the same mechanism that makes delayed resolutions in Romantic music emotionally powerful: the longer a composer withholds the resolution of ti, the more tension accumulates.
Understanding these tendencies also sharpens harmonic dictation. When a chord changes, the melody note often tells you something about the harmonic function: if the melody is sitting on fa, the chord is likely subdominant (IV) or the dissonant seventh of V7. If it is on ti, the chord is probably dominant. The scale degree gives you a handle on the harmony even before you analyze it consciously. This is why musicians who have deeply internalized scale degree tendencies can follow harmonic progressions by ear much more quickly than those who only know them theoretically — their inner ear is already tracking the tonal logic while they listen.
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