Post a game that has one of the best and the most awesome background music and overall soundtrack in gaming

Fucking Skyrim bitches.

I love the music of many video games, but I think my favourite has got to be Final Fantasy: Crystal Chronicles.

I've made a more in-depth answer here:
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King of Fighters XIII!!

Hmm, I don't know about the best one. I love a ton of video game music. But, I'm feeling nostalgic right now. I'm just going with Megaman X because Storm Eagle is one of my favorites. I also have a hard time getting off the stage select screen with that awesome music blasting x3

I thought the Castlevania series, especially Symphony of the Night had cool background music.