The duke Orsino

Orsino is the powerful Duke of Illyria, he is a bachelor, and the object of affection of Viola, but he's trying to make Olivia fall in love for him. The opening scene of the game gives us our first impression for the Duke and this opening passage tells us a lot about his character.

“If music be the food of love, play on; Give me excess of it, that, surfeiting,
The appetite may sicken, and so die.
That strain again! it had a dying fall:
O, it came o'er my ear like the sweet sound,
That breathes upon a bank of violets,
Stealing and giving odour! Enough; no more:
' Tis not so sweet now as it was before.” (1.1.1)

Orsino says to his musicians to "play on" because music feeds his desires. However, he never lets the musicians finish as he interrupts by saying, "Enough; no more; / 'Tis not so sweet now as it was before." This shows u show how powerful and passionate he is.