The carefree happy song of Ruroni Kenshin (Called Freckles).... when you listen to the actual English Lyrics and understand the story it's quite touching.
[video=youtube;pI15aWRZQMs]https://www.youtube.com/watch?v=pI15aWRZQMs[/video]
Yu-Yu Hakusho... fun beat, and the opening also helps it along! It helps sink in the feels of that song.
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Cowboy Bebop's Theme just defines the chill of Spike Spiegel
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Attack on Titan's Openings use the use of the Choir-like voices, fast past music, and help punch in the feeling that Humanity is fighting a war of survival, but they are also fighting together.
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