This word is acceptable for play in the UK dictionary that is being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. Alternative form of ritornello.

n. A short return or repetition; a concluding symphony to an air, often consisting of the burden of the song.

n. A short intermediate symphony, or instrumental passage, in the course of a vocal piece; an interlude.

n. In music, an instrumental prelude, interlude, or refrain belonging to a vocal work, like a song, aria, or chorus; also, one of the tutti passages in an instrumental concerto. Also formerly called a symphony.

"The word _symphony_ was formerly used synonymously with _ritornelle_, both words being applied to instrumental interludes between parts of vocal works, but this usage has now entirely disappeared."

ritornello   

interlude