[quote=@Corvidae]
<Snipped quote by Dead Cruiser>

Search no further - [url=https://www.youtube.com/watch?v=ZIniljT5lJI]I've found it.[/url]

[s]In all seriousness, good luck; theme songs are all kinds of frustrating.[/s]
[/quote]

[url=https://www.youtube.com/watch?v=B-Wd-Q3F8KM]This you mean?[/url]

In general, I find that the issue with applying themes to RPs as a whole is that different moods demand different music. Much like visual media.

Luckily I have some Jazz/Orchestral tracks saved up from various mecha anime. Can always count on those for having high quality and diverse soundtracks.