The term 'concluding musical passage' is often referred to as a CODA, which is a four-letter word. A CODA is a passage of music that comes at the end of a piece or section of a piece and serves to bring it to a satisfactory conclusion. It is usually quite distinct from the rest of the piece and often has a different character or mood. Codas are often used to add a sense of finality or closure to a piece of music.