The term 'sonata finale, often' can be broken down into two crossword solutions: CODA (4 letters) and RONDO (5 letters). A CODA is a passage of music that serves as a conclusion to a piece or movement. It is typically found at the end of a sonata, symphony, or other large-scale composition. A rondo is a musical form consisting of a recurring main theme alternating with contrasting episodes. It is often used as the finale of a sonata or other large-scale composition.