A lot of the new tracks in V13 were made by Zumi, so I guess that would make them 'from' Rejuvenation? It's gonna be a bit before they're uploaded to YouTube, though.
If I'm remembering right, the new Team Xen battle themes (as well as the new Gym Leader theme) were made by GlitchxCity, while all the other custom tracks in V13 were made by Zumi