Almost anything by Falcom Sound Team JDK tends to be great.
[spoiler:d594c48d20][youtube]http://www.youtube.com/watch?v=Y9Mam93QIQo[/youtube]
[youtube]http://www.youtube.com/watch?v=oSgVppJMKNo[/youtube]
[youtube]http://www.youtube.com/watch?v=3fITJ1QBzUI[/youtube][/spoiler:d594c48d20]
[spoiler:d594c48d20]
Metal Gear Ac!d 2
[youtube]http://www.youtube.com/watch?v=aJlvQfVePDE&list=PLhHcMbVmbwCcr0syjrQg3plnJCVe-_a8c[/youtube]
[youtube]http://www.youtube.com/watch?v=hYMC83VWAnU&list=PLhHcMbVmbwCcr0syjrQg3plnJCVe-_a8c[/youtube]
Generally, I'm not a fan of the alert music in Metal Gear, but I've taken quite a liking to this one. MG in general has good music.
[youtube]http://www.youtube.com/watch?v=0Tn4h2IjnUU[/youtube]
[youtube]http://www.youtube.com/watch?v=matq6G5jgyE[/youtube][/spoiler:d594c48d20]
[spoiler:d594c48d20][youtube]http://www.youtube.com/watch?v=uX0hU7jQ5O4&feature=player_embedded[/youtube]
[youtube]http://www.youtube.com/watch?v=LMf-kDeAYCY[/youtube]
I highly recommend checking out the Nier OST. One of the best in recent years.
[youtube]http://www.youtube.com/watch?v=3yhuI4Gh8Kk[/youtube]
RE: R for best RE OST hands down, no contest. Wipes the floor with RE5, and 6.
[youtube]http://www.youtube.com/watch?v=4gomiKDnNHA[/youtube]
And of course, can't post this without some SNES goodness.
[youtube]http://www.youtube.com/watch?v=QOWUSsFar-s[/youtube][/spoiler:d594c48d20]