So, since I want to illicit a positive experience, in order to entice this person to seek out further material from this band, as well as, others, I would most likely recommend, something that is quite melodic, with a bit of bite.
I realize this is a difficult question, but here is my suggestion (as of posting this):

10 Responses
Led Zeppelin IV; if that doesn’t do it, you have a Cat Stevens, Hellen Reddy fan who thinks the Eagles are too heavy
LOL!!!