noun
Refers specifically to a musical piece in waltz form, not the dance itself. Often used in classical music contexts.
See also: ワルツ
ショパンの円舞曲はとても美しい。
Chopin's waltzes are very beautiful.
ワルツ is a more common loanword for both the dance and the music. 円舞曲 is a formal, Sino-Japanese term used mainly for the musical composition.
Compound of 円舞 (enbu, 'round dance') + 曲 (kyoku, 'musical piece'). A calque or translation of the Western concept of a waltz as a circular dance, though the term now refers to the composition.