Loud:
* Forte (f): Loud
* Fortissimo (ff): Very loud
* Sforzando (sfz): A sudden loud accent
* Crescendo (cresc.): Gradually getting louder
* Forte-piano (fp): Loud, then immediately soft
Quiet:
* Piano (p): Quiet
* Pianissimo (pp): Very quiet
* Decrescendo (decresc): Gradually getting softer
* Piano-forte (pf): Quiet, then immediately loud
These terms can be used to indicate the overall dynamics of a piece of music, or to describe specific passages or sections.