I didnt even know there was music in HL2, so i guess i wont miss it. As long as freeman has teh same face ill be happy.
I've been playing HL2 Cinematic Mod (keepign the original OST, of course) and it's phenomenal. Can't praise his work enough.
That said, the new guy, yeah, he'll do fine. Portal 2's music was pretty sick, I'd love to see what he does with the new HL installment.