A course, on a stringed musical instrument, is two or more adjacent strings that are closely spaced relative to the other strings, and typically played as a single string. The strings in each course are typically tuned in unison or an octave. Course may also refer to a single string normally played on its own on an instrument with other multi-string courses, for example the bass (lowest) string on a nine string baroque guitar. An instrument with at least one (multiple string) course is referred to as coursed, while one whose strings are all played individually is uncoursed.