Why Is an Accent Mark Not Simply ‘Play This Note Louder’?

When adult learners see a “>” above a note, they can easily read it as a separate instruction to add force: play normally, then make this one note suddenly louder. The result is often not an accent but a hard bump in the phrase. An accent asks for prominence in relation to the surrounding sounds. A clearer attack may be part of that prominence, but the prevailing dynamic, the note's duration, its harmonic position and the phrase's direction also matter.

The same accent in a quiet melody and in a forte chord should not produce a copied movement. In the first case, the note may need only a little more definition while the singing line remains intact. In the second, the impact may be stronger, but it must still lead somewhere. Once a piano hammer has struck the string, the sound can only decay naturally; unlike a string player, a pianist cannot keep increasing a sustained tone. The accent's shape therefore has to be prepared around the keystroke.

Take two beats before and after an accent. First play the phrase without adding it, then restore the mark and ask whether the structure becomes clearer. If all you hear is a jump in volume, its role in the sentence is still unexplained. Research on piano keystrokes also shows that key depression is organised across the fingers, wrist and upper limb, so prominence should not be reduced to one finger pressing harder. The central point is simple: an accent is not an absolute number of decibels but a directed relationship.

https://open.umn.edu/opentextbooks/textbooks/open-music-theory
https://link.springer.com/article/10.1007/s00221-007-1184-9