Assertion: guitar's course | /r/HasProperty | single
Facets:
Source sentences:
text: The guitar originally had four courses of strings, three double, the top course single, that ran from a violin-like pegbox to a tension bridge glued to the soundboard, or belly; the bridge thus sustained the direct pull of the strings.
text: It had six single courses and was tuned like the modern classical guitar, with a fretboard located between two curved arms recalling the shape of the ancient Greek lyre.