I’ve shown you how to share files with individuals via YouSendIt. I’ve also talked about using Dropbox and Carbonite to share files among your own devices. But suppose you want to share (legal original) music or sound files to a group of people, e.g., your band, or with the general public?
If you have your own website you can stream MP3s from there – but that could quickly use up your monthly data transfer allotment if the tracks are popular or large. If you are selling the tracks you could set up a Bandcamp account and post them there.
But if these are files like band practice recordings, rough drafts, non-music audio samples, etc. you may prefer to use SoundCloud.