He would admit to being mildly surprised - being the only source of music in the room, he thought he would be heard, but he wasn't expecting anyone to be actually listening.
Even better that it was someone who understood the words to mean more than just incoherent syllables.
Tsukuyomi stood and respectfully lowered his head, as was expected of him especially when greeting someone he did not know.
"Iie. Arigatou gozaimashita."
Being one of the rich and famous and having many desperate mere mortal fans aside, It was nice to know that he could be appreciated even in a setting like this when he anticipated not being known at all.
Perhaps tonight was not to be a lonely, boring night after all.