i have an idea as to what sort of music or soundtrack u could put in nh2. there's this really good band called midnight syndicate. they make horror themed music that would fit very well in games or movies. the link to their site is below.
go to the "contact us" section to ask them about licensing if need be.
check them out on i tunes. some of their songs are creepy and they create a dark atmosphere.
some pieces from them that u should consider are:
grisly reminder (creepy piano/music box music)
footsteps in the dust (really creepy child laughter towards the end of the song)
and their other songs in general. especially from their album; "the thirteenth hour"