The arcade original that started the BlazBlue sound. This 2008 OST is where those character themes first hit cabinets and people lost their minds. "Rebellion" for Ragna and "Lust SIN" for Jin set the template, heavy rock with fighting game swagger.
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"Catus Carnival" is Taokaka's theme and it's this goofy bouncy thing that perfectly matches a cat person who just wants to fight and eat. "Queen of rose" for Rachel goes elegant and gothic. The contrast between characters is the whole point.
"Under Heaven Destruction" plays when Ragna fights Jin and combines both their musical identities into something personal. The rivalry theme concept already fully formed. If you want to hear a fighting game soundtrack that defined an entire franchise's identity on day one, this is ground zero.