Rhapsody (noun)

1. A piece of music that is highly emotional and expressively free in form.
2. A speech or writing that expresses great enthusiasm or excitement.

Origin:

From the greek word rhapsoidia, meaning "a piece of extemporaneous poetry or a recital of such poetry", which is derived from the word rhaptein, meaning "to stitch" or "to weave" and the word aoidos, meaning "singer" or "poet".

Examples:

1. Beethoven's Moonlight Sonata is a beautiful rhapsody.
2. The singer's rhapsody about love was moving.
3. The novelist's rhapsody about the sea was evocative.
4. The rhapsody in the poem was about the joys of life.
5. The rhapsody of the speech was about the future of the country.