The FL is in some sort of abusive marriage and her husband locks her up in a room where she dies I guess. When she wakes up she's isekai-ed into some historical era. The ML visits some kind of brothel (?) and the main girl there has a crush on him so she sees the FL as competition. To mock the FL, she holds a kind of music competition where they have to play some kind of historical string instrument and the FL surprises everyone with her music. I think the FL was actually a music composer in her previous life

Did you find the name? It seems interesting

Hi) My best guess this is title called You can’t kill me: The secret bride of the black wolf. p.s. Had to register eventually after more than 10 years of unauthorized raids just to post this comment 🤣