Locate the complete infinitive phrase and identify its use. to play the piano was melanie's dream.

The correct answer is: "To play the piano" . Here is used as a noun.

Explanation:

Infinitive phrases are those phrases that begin, as the name implies, with an infinitive (to + verb in the simple form).

As we can see in this case: "To play the piano".

The function of the infinitive phrases can be: adjectives, nouns or adverbs.

As a noun, its function is like the subject of the sentence.

the term that describes the best dear evan hansen