^It's somewhat hard to sing yes, and a lot of singers tend to overdo it by adding a lot of vocal runs and acrobatics until the melody is almost unrecognizable. It's refershing to hear Emmy sing it simply and respectfully (and with the right words!) .
It's sung prior to most sporting events in the US and they tend to vary the singers who perform it (obviously professional events get professional singers and so forth). Emmy's sang it a few few events, but it's not a regularly gig for her really.
Glad you got the interview (even if you couldn't watch the whole thing!)