[LAU] [OT] Audio file sharing sites

I've seen some folks post their music created with linux to some sharing sites. I have two questions: 1. What are some recommended sites? 2. Are tracks mixed end to end recorded live from a rave 15 years ago OK to share with regard to copyright? TBH, I don't even know who the artists or what the song titles were any more as they're all named something generic like track01.wav. I may not even have the vinyl any more as those thing frequently changed hands or got traded up as the scene changed. So I pose it to the LAU community; can I share these files legally and if so, where? If not, I'll just keep sending CDs to people who ask. -Scott