From Zero to Mozart
Stage 7Vibrato & expressionLesson 9 of 27 · Left hand

The pulse ladder

Now the pulse goes onto a real note, and you build it with a metronome — the same ladder every method uses: one rock per beat, then two, then three, then four, then continuous. Slow, even, and — at first — without the bow.

The ladder

Set the metronome to 60. Put your 1st finger on B, A string, in tune. No bow yet. Then:

60 bpm
The bottom two rungs. Bar 1: one rock per beat. Bar 2: two per beat. Each 'rock' is a full backward-and-return of the fingertip. Tap it on your knee first, then do it on the string. Then keep climbing — 3 per beat (triplets), then 4 (sixteenths), then continuous.

The honest arithmetic

Rocks per beat, times the tempo, divided by 60, gives you the speed in wobbles per second (Hz):

  • 4 rocks per beat at 60 = 4 Hz.
  • A real expressive vibrato is about 5–7 Hz — call it 6.

So even the top rung of this ladder, at this tempo, is still a practice speed, not a performance speed. That's fine and it's deliberate. You get to 6 Hz over months, and you get there by the motion staying loose while it gradually quickens — not by cranking the metronome up and forcing it. A fast, tight vibrato is worse than a slow, loose one.

Add the bow, then take it away again

Once a rung is even without the bow, play a slow bow through it and listen: is the pitch actually shimmering, evenly, around the centre of B? If the rhythm falls apart the moment the bow moves, drop the bow and go back to silent practice — the two hands are learning to cooperate and that takes its own time.

Try

One climb of the ladder, 1 → 2 → 3 → 4, on B, no bow, at 60. Then the same with a slow bow. Then move to D (3rd finger, A string) and climb it again. Five minutes total. Stop the moment the hand tightens.

The usual mistake

Chasing the number — tightening the hand to force 4 even rocks per beat when 3 is still the honest limit. The metronome is there to keep you even, not to push you faster. The other mistake is jumping straight to "continuous" and getting a nervous, uneven flutter — the ladder exists so each speed is built on an even one below it.