It seems that SRW Alpha 3 videos have been reduced to only a handful on youtube. But just search 'Gong' to listen to the song that Basara and Minmei 'supposedly' sang to defeat the last boss. Its by JAM project though and its one of Nico Nico's favourite songs, probably their choice for the most hot blooded song ever. And meanwhile you can go insane watching the hundreds of MADs that go along with the song like this one:
http://www.youtube.com/watch?v=9Y6cPENK6Ts <- epic Nico craziness