Complete the proud grandmother's text message to her friend.

My grandson's rock band is so loud, but he plays the drums very _____!

The correct answer is well.

"Well" is the irregular adverb form of the adjective "good." We use adverbs to describe verbs (how he plays the drums). "Goodly" is not a word we use for this, and "good" and "nice" are adjectives used for nouns!