No, I have to admit I've never heard of those two bands. I do know the Beach Boys, and am a bit of a fan. I'm actually quite a bit fan of progressive music in general, and I like all the innovative stuff the BBs did, basically influencing the Beatles and then quite a few of the progressive bands of the 70s and 80s.
I wouldn't call myself a Christian artist per se - I've not really tried my hand at writing explicitly Christian lyrics, and from what I've seen it's really easy o pigeonhole yourself as a Christian artist. A couple of American musicians I really respect in that regards are A
ndrew Peterson and
Andrew Osenga.
I think Andrew O in particular does an amazing job of tackling Christian themes and being thoroughly 'Christian' in his music without being a Christian music artist. He wrote a concept album about a divorced man who is distraught when his ex wife dies and so goes out on a spaceship into a deep space mission he expects never to return from to deal with his emotions. It's amazing.