Dynamics are the changes in loudness in a piece of music, and they carry much of its expression. The same phrase can sound calm or urgent depending on whether it is marked soft, loud, or shifting between the two. Composers use music dynamics to tell performers how loud to play and when to change. This guide covers the markings from pianissimo to fortissimo, gradual changes like crescendo and diminuendo, sudden accents like sforzando, and how to add them to your own score in Flat.
What are dynamics in music?
The two words behind every marking are Italian: piano (abbreviated p) means soft, and forte (f) means loud. The instrument we call the piano is itself short for pianoforte, named because, unlike the harpsichord before it, it could play both soft and loud.
One idea matters more than any single marking: dynamics are relative, not absolute. There is no fixed decibel value attached to forte. A forte on a solo flute and a forte from a full orchestra are very different volumes, and a marking tells the performer how loud to play within the context of that passage, not at a set level. That relativity is what makes dynamics expressive rather than mechanical.
The dynamic scale: from pianissimo to fortissimo
Most markings are built from piano and forte plus two modifiers. Mezzo (m) means moderately, so mezzo-piano is moderately soft and mezzo-forte is moderately loud. The suffix -issimo means very, so pianissimo is very soft and fortissimo is very loud. Stack the suffix again and you reach the extremes composers save for the edges of a piece.
Here is the common scale, quietest to loudest:
| Marking | Italian | Meaning |
|---|---|---|
| ppp | pianississimo | extremely soft |
| pp | pianissimo | very soft |
| p | piano | soft |
| mp | mezzo-piano | moderately soft |
| mf | mezzo-forte | moderately loud |
| f | forte | loud |
| ff | fortissimo | very loud |
| fff | fortississimo | extremely loud |
Most music lives between pp and ff. The extremes at ppp and fff appear when a composer wants more contrast, and some scores push further still, but the everyday working range is the six steps from pp to ff. Many players treat mezzo-forte as a neutral baseline and shape everything else around it.
Gradual changes: crescendo and diminuendo
Single markings set a level. To move between levels, composers use gradual changes. A crescendo (cresc.) means grow louder; a diminuendo (dim.) or decrescendo means grow softer. Both are often drawn as hairpins: an opening wedge for a crescendo, a closing wedge for a diminuendo. The hairpin and the written word mean the same thing.
You can shape the pace of the change as well. Poco a poco crescendo means louder little by little, stretched over many bars, while a crescendo packed into two bars feels urgent and breathless.
Ravel's Boléro is the textbook case. A single melody repeats while the orchestra grows from a near-silent snare and flute up to the full ensemble, one long crescendo carrying the entire piece. Played well, that slow build holds an audience more tightly than any sudden change could.
Sudden accents: sforzando, fortepiano, and subito
Not every change is gradual. Some markings land on a single moment. Sforzando (sfz or sf) is a sudden, strong accent on one note or chord, a sharp push that stands out from whatever surrounds it. Fortepiano (fp) means loud then immediately soft, a hit followed at once by a drop. The word subito means suddenly, and it sharpens any marking it joins, so subito piano means drop to soft instantly, with no taper.
Haydn wrote one of the most famous sudden shifts in his Symphony No. 94, nicknamed the "Surprise." The second movement opens with a gentle theme played softly, the strings repeat it even more quietly, and then the full orchestra lands a single fortissimo chord out of nowhere before the music slips back to quiet as if nothing happened. It is the textbook subito moment, a sudden change with no lead-up, traditionally said to have been aimed at dozing concertgoers (a story Haydn himself waved off).
How to add dynamics in Flat
In Flat, dynamics are a few clicks rather than special characters to hunt for. Select the note where the change should begin, open the dynamics tool, and choose a marking from pp to ff (the keyboard shortcuts 1 through 6 map to pianissimo through fortissimo). For gradual changes, add a crescendo or diminuendo hairpin across the notes you want it to span.
Try this in Flat: enter a short eight-note phrase, mark the first note p and the last note f, then add a crescendo hairpin between them and press play. Flat reads the markings during playback, so you hear the swell rather than only seeing it. Then swap the crescendo for a single sforzando on the last note and listen to how different the same phrase feels.
For the full list of markings and how Flat interprets them on playback, see the help guide on adding dynamics.
Bringing it together
Dynamics turn a correct performance into an expressive one. The scale from pianissimo to fortissimo sets your levels, crescendo and diminuendo move between them, and accents like sforzando mark the moments meant to jump out. None of it is locked to a fixed volume; it all works in relation to the music around it, which is exactly what gives a performer room to interpret. The quickest way to internalize the difference is to hear it.
Ready to put this into practice? Flat lets you add dynamics to your score and play them back instantly in your browser, no download needed. Try Flat for free.