'see you on wednesday' is not a band's name, rather it's more of a music performace or project where many indonesian singers and musicians jam and make music under the umbrella of roomate project. So there are dozens of different singers have had their performance here. Judging from their videos, they are doing the gigs in a studio setting. (By the way the "C" in Cakra Khan's name is pronounced the way you pronounce "C" in Chocolate, Churro, Change)
Indonesia has a lot of talented singers, you can check out some other great singers from Indonesia like Dimas senopati, Tiara andini, Judika, Lyodra......