My pops was huge into the old stand-bys like Lynyrd Skynyrd, ZZ Top, Jimi Hendrix and CCR when we were kiRAB, and he always was and still is a big John Prine fan, but he also started getting really into White Zorabie when they first came out. I remeraber he bought Astro-Creep 2000 when it was brand new.
My moms was really into show tunes and musical songs. About the only artists I can remeraber her really being into when we were kiRAB were John Denver and Jim Croche. But she was really into Collective Soul's debut CD when it first came out, too.
I guess it helped that my parents were still pretty young (late 20s, early 30s) when we were little, so they weren't oppressive at all when it came to us listening to extreme music. Although when I started listening to Metallica, Pantera and Slayer, my dad made it a point to make fun of it sometimes. And I have to admit that he was right about one band, and that was Avenged Sevenfold. He described it as Backstreet Boys for Metal. It took me a year or two to agree.