a term loosely used to describe a piece for solo voice that is neither quite an aria nor recitative. An arioso did not normally follow any strict form or structure and, while 'melodic', never had the finely wrought melodic content expected of an aria.
In classical music, arioso is a style of solo opera singing between recitative and aria. Literally, arioso means airy. The term arose in the 16th century along with the aforementioned styles and monody.