Make levels in EBA/Ouendan

Is there any way to replace songs in Elite Beat Agents/Osu! Tatakae! Ouendan!
and make your own levels?
Or at least play the pc game "OSU!" (http://osu.ppy.sh/index.php) on a R4DS? ???
I really want to make one with the Nico Nico Douga Suite.Sorry if I'm posting this in the wrong place, I wasn't sure where I should. :-\