A sonata is a type of musical composition, typically written for a solo instrument or a small ensemble. The crossword solutions for the term 'sonata, e.g.' are 'opus' (4 letters) and 'Hyundai' (7 letters). Opus is a Latin word meaning 'work' and is often used to refer to a musical composition. Hyundai is a South Korean automobile manufacturer that has also released a line of musical instruments, including pianos, guitars, and violins.