Do the dynamic markings in a music score have to be same for every instrument at that particular section?

Dynamic markings do not have to be the same for every instrument at a particular section of a music score. While the overall dynamic level may be indicated, conductors and musicians interpret and apply dynamics according to the character and range of each instrument. Factors such as the tone color, tessitura, and individual part writing can influence the specific dynamic level chosen for each instrument. Musicians take into account how their instrument blends with others to achieve the desired musical balance and expression.

For example, in a passage marked mezzo-forte (mf), a flute might play slightly softer to avoid overpowering the string, while a trumpet may project more prominently to cut through the ensemble. This practice allows for a more nuanced and detailed rendition of the composer's intended dynamics and contributes to the overall richness and expressiveness of the musical performance.