pomposo

[Italian] A directive to a perform the indicated passage of a composition in a pompous, stately, or ceremonious manner.

a little Italian term for a little. Typically used to modify tempo markings as in "accelerando poco a poco" meaning "getting faster little by little."

little by little : gradually : little by little : gradually.

più / (pjuː) / adverb. music (in combination) more (quickly, softly, etc): più allegro; più mosso; più lento.

In music, allegro distinguishes a movement that's meant to be played very quickly. Your piano teacher might instruct you to try playing a piece allegro. If you're reading sheet music and you see the word allegro, you'll know that particular section or movement should be played in a lively, spirited way.

Allegro – fast, quickly and bright (109–132 BPM)

: to a slight degree : somewhat. used to qualify a direction in music.

Poco can be both an adjective or an adverb depending on the context: if it's before a noun or after a verb. And it means “little,” “few,” “not many” or “not much.” Let's take a few examples: Nos queda muy poco vino para los invitados. – We have very little wine left for the guests.

Accelerando would work nicely. If you really want to emphasize it being gradual, you can write poco a poco accelerando or poco a poco accel., which means "get faster bit by bit". EDIT: to elaborate, you can get the effect of accelerating by doing what you suggested and shrinking the note values.

più p, standing for più piano and meaning "quieter". più f, standing for più forte and meaning "louder".

piupiu in British English (ˈpiːuːˌpiːuː ) nounWord forms: plural -piu. a skirt made from the leaves of the New Zealand flax, worn by Māoris on ceremonial occasions.

Allegro moderato – close to, but not quite allegro (116–120 bpm) Allegro – fast and bright (120–156 bpm) Molto Allegro or Allegro vivace – at least slightly faster and livelier than allegro, but always at its range (and no faster than vivace) (124–156 bpm) Vivace – lively and fast (156–176 bpm)