Assertion: keyboard instrument's string | /r/CapableOf | keep in tune
Facets:
Source sentences:
text: The advantages of this system compared with unfretted instruments (see below) include relative ease of tuning (with around half as many strings to keep in tune), greater volume (though still not really enough for use in chamber music), and a clearer, more direct sound.
text: Disadvantages include a smaller volume, even though many or most unfretted instruments tend to be significantly larger than fretted instruments; and many more strings to keep in tune.