I love classical music, but not for coding. It's too musically interesting and it pulls me off task. I'll be fine and then it gets to that one part, and then I'll notice that I've been actively listening to the music and not coding for 10 minutes.

I tend toward electronia (usually) without vocals. I'll find a suitable artist and get several of their albums and listen to all the albums on loop. For me this is enough to quickly gain that familiarity you mention, hearing the same songs in the same order all day long.