As for Chris' knowledge of the opera, I don't think it's all that extensive. Remember that OKCupid gives you multiple choices. Chris likely picked that one to give the impression he likes opera, or at least music. It's quite possible that he doesn't know who Plácido Domingo or José Carreras even are! In fact, considering his track record for knowing jack shit about most celebrities, I'm inclined to say it's pretty likely. Still, if it was an OKCupid template answer, how ironic that he would have two Spaniards to pick from, given his frequent butchering of the Spanish language.
Of course, it's possible that some of Bob's appreciation for music did get through Chris' thick skull, though unlikely given how genuinely ignorant Chris is of the world (if and how decidedly unsubtle he is about every other aspect of his life. I'd think we'd have seen some sign of any interest in opera or musicals before. Besides, I though Bob was mostly into jazz, though some people seem to suggest 'world music' (which conjures a hilarious mental image of classic Chris dancing about to the likes of Shizuko Kasagi, Mory Kanté, Taraf de Haïdouks, Miriam Makeba, Yma Sumac, Mahi Beamer, Bob Marley, King Sunny Adé, Ravi Shankar, and of course William Onyeabor

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