Sentence:  He pointed out to the young musicians that the National Gallery `` <WSD>is</WSD> the only museum in the country to have a full-time music director , Richard Bales , I 'm sure you 've heard af him and his record , ' The Confederacy '' ' . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)