Deception (1946), 5

A piano teacher believes that her fiancé was killed on the battlefield. When he miraculously returns, they decide to marry, but are threatened by a wealthy, egotistical composer the piano teacher started dating on the rebound after she became convinced her love had died.
1h 55min | Crime, Drama, Film-Noir | 26 October 1946
Director: Irving Rapper
Stars: Bette Davis, Paul Henreid, Claude Rains.

https://www.imdb.com/title/tt0038461/
Watched online, good print.

Classical music is "performed by" the leads (dubbed). So this would pass my definition of musical.

Remake of Jealousy (1929). And that is the subject of this film: both romantic and professional jealousy. I dislike the story, the melodramatic score, the performances. The only thing I liked (other than the music performed) was the ambiguous unresolved ending. I'm not a fan of BD; I find much of her acting overwrought. I'd say All About Eve ('50) is the only film starring her that I bought for that film (not in a box set, or really for a costar), and AAE is more about the entire cast and the Mankiewicz labors.

Really, it's not worth suffering through the dramatics to hear the music performed (the +). PH gets violent toward BD, she gets violent toward CR, and CR threatens to destroy PH emotionally. Yechh.

Warner, dir. Rapper; 5+