5Ds introduces a slew of hot blooded music that continues to pump you as you watch. The first track "Speed World" sets the standards by itself but then after that in episode 5, you get hit with Jack Atlas' battle theme which FAR exceeds our expectations. Then Izayoi Aki shows up and we get blown back further.
We Ride to Survive deserves honorable mention, even though it didn't make it to being a theme song. This and the winner as stated above had a very close call in the contest to pick the theme song, with only one vote difference.
And if you thought that was awesome, you ain't seen nothing yet. In Episode 109, something happened that doesn't happen often in Yu-Gi-Oh!: a vocal song played during an episode. This song is ''Clear Mind''. Its awesomeness is matched only by the Crowning Moment Of Awesome that happens when it first plays.
Pretty much all of the opening songs (Including surprisingly the dubbed openings).
For BGM, there's Jack, Aki, and Yusei's battle themes, the preview music and Clear Mind (which is performed by the one and only Masaaki Endoh who also did the 4th Opening).
Counterattack is the perfect sort of song to accompany an awesome turnaround. And if an enemy duelist summons a big, impressive monster for the first time...chances are you'll get to hear Confrontation.