Sung-through

The adjective or adverb sung-through (also through-sung) describes a musical, musical film, opera, or other work of performance art in which songs entirely or almost entirely stand in place of any spoken dialogue. Conversations, speeches, and musings are communicated musically, for example through a combination of recitative, aria, and arioso. Early versions of this include the Italian genre of opera buffa, a light-hearted form of opera that gained prominence in the 1750s.
A through-sung opera or other form of narrative work with continuous music may also be described as through-composed.