Interesting topic.
I grew up in a very musical family. Both my parents were in fairly successful local rock'n'roll bands in the 60's/70's, and my father has made a career in the major music industry for the past 25 years. So being interested and involved in music has always seemed like a very natural thing to me.
Apart from some 60's records and a few silly new wave albums that were given to me after my mother passed away when I was 14, I can't recall having ever dug too deeply into either of my parents' record collections, or finding much of anything interesting if I did. By 14, I had developed seemingly opposing tastes for 60's rock (thanks, mom!) and punk rock. I bought a copy of the first Clash LP on the same day as I bought a copy of Jimi Hendrix's "Band of Gypsies" LP. I don't know what happened to the Hendrix LP, but the Clash LP is still with me today.
But I think there are some additional cultural aspects that are at play, as well. For one, I grew up speaking two languages. That's important not only because I was exposed to a lot of music that most, uh, "normal" white people (hahaha) probably think is just a bunch of castaneta-driven gibberish, but because it's also helped to sorta relax my ears and brain so that it doesn't seem strange to me to listen to singing in languages other than English. I've noticed that a lot of people I play music around say things like "it's good, but what are they saying?", or "somebody needs to record this song in English!", implying that this music WOULD be good, if it were only recorded in English. This whole approach towards music (or anything, really) strikes me as bizzare, and I think that's a result of my upbringing.
Incidentally, I mostly listen to African and Slavic music. I don't speak any African language, and my knowledge of Russian is rudimentary at best (and generally doesn't help me actually enjoy the music, since I know just enough to sing along with most things, but in many cases not enough to explain what they're about when people ask). Hmmm.
So...nature or nuture? Well, I can't say anyone I grew up with or am currently accquainted with (including my family) has ever asked to borrow any CD from me. So I don't know. If this were a poll, my vote would be for neither, but only in my case.
Oh, and since I like those charts, too, here:
Cream > Clash > Grazhdanskaya Oborona > Hirut Beqele
It seems like I'm missing about a million steps there, but then I remember that it doesn't have to make sense in a linear way. Hahaha.