What Is the Downy Owl

The “downy owl” is a typical symbol for a gloomy atmosphere, night and darkness.

What is the rhyme scheme of John Keats Ode on Melancholy?

It is written in iambic pentameter with the rhyme scheme ABABCDECDE for the first two stanzas and ABABCDEDCE (with the rhyming of second- and third-to-last lines switched) for the third stanza.

Can burst Joy's grape?

And feed deep, deep upon her peerless eyes. Can burst Joy’s grape against his palate fine; His soul shalt taste the sadness of her might, And be among her cloudy trophies hung.