Although the Italian term "sonata" often refers to a piece in sonata form, it is important to separate the two. As the title for a single-movement piece of instrumental music—the past participle of "suonare", "to sound", as opposed to "cantata", the past participle of "cantare", "to sing"—"sonata" covers many pieces from the Baroque and mid-18th century that are not "in sonata form". Conversely, in the late 18th century or "Classical" period, the title "sonata" is typically given to a work composed of three or four movements. Nonetheless, this multi-movement sequence is not what is meant by sonata form, which refers to the structure of an individual movement.