Which of the following is the best description of the speaker’s mood in the lines “could i revive within me / her symphony and song?

It seems like there are multiple answers to choose from. Although these have not been given, it can still be possible to answer this question.

In this stanza, the speaker is remembering the powerful "symphony and song" he heard during his vision. He cannot quite "revive" it, however. This means that he cannot quite recreate the music.

He wants to, of course -- the following lines describe the "deep delight" that recreating the music would cause him to feel. 

Because of these points, the speaker's mood is one of longing. Therefore, ay answer that contains the idea of longing, wistfulness, or yearning would be correct.