One long tone, frog to tip · From Zero to Mozart

The first real skill of this stage is also the plainest: one sustained, even sound from frog to tip, and back. It has a name — son filé, a "spun" tone — and it is the exercise every serious player keeps doing for life. It's hard for one reason: the bow is not evenly balanced, so an even sound is something you make, not something that happens.

Why it isn't automatic

Near the frog the bow is heavy — its weight plus your hand's weight sit close to the string, and it wants to dig in. Near the tip the bow is light — the tip is the far end of a lever with the pivot in your hand — and the sound wants to thin out and fade.

So to keep the sound the same the whole way, you add a little arm weight as you travel toward the tip and release it as you return to the frog. It's a constant, quiet adjustment. Galamian put it exactly: equal pressure throughout the bow gives unequal pressure on the string. Levelling that out is the whole exercise.

30 bpm

How to play it

Start at the frog. Move the bow at a constant speed — don't rush the easy middle third. As you pass the middle, start feeding a little more weight through the arm; ease it off as you come back. Listen, don't watch.

One whole bow down, one whole bow up, on the open D string, as slow as you can hold a steady sound. Aim for a note that sounds identical at the start, the middle and the end — no swell, no dip, no fade.

Keep it in one lane — "the highway"

The bow travels parallel to the bridge, in one straight line, the whole stroke. Your arm opens and closes on a hinge while the bow has to go straight — which is genuinely awkward at first, and worth a mirror. If the bow drifts toward the fingerboard or the bridge mid-stroke, the tone changes underneath you (you'll meet exactly why in the-five-lanes). One lane, start to finish.

How much hair

Tilt the stick slightly away from you and less hair touches the string; hold the stick flat and all the hair is on. The working rule: flat hair for a full, strong sound; tilted for something soft and sweet. Start flat — it gives the fullest, most secure tone and one less thing to think about. Near the frog a slight tilt also helps keep the bow straight and the wrist loose.

Try it

Try

Four slow whole bows on open D at the very start of every practice session — down, up, down, up — listening only for evenness. Then move to open A, then open G, then open E; each string feels different under the bow. When you can hold one string steady for a slow count of ten each way, you've done a real day's work on tone.

The usual mistake

Rushing the middle and starving the ends — a bulge of sound in the easy centre of the bow, then a thin, hesitant tip and a scrapey frog. The fix is a constant speed: the bow covers the last inch near the tip at the same rate as the first inch near the frog. The second mistake is watching the string instead of listening — do this one with your ears.