Save your songs in MP3 format. MP3 is a compressed format, popular for its small and manageable file sizes and commonly used on digital media players and streaming servers. Many sites even require MP3 format, so it helps to prepare your music before uploading. If you do not already have MP3-formatted songs, open your song files using your recording software, choose your "Export" option and then choose "MP3" as your exported format.
Sign up as an artist on music-based and music-friendly social networks. Popular examples include MySpace, PureVolume and Reverb Nation. Visit each site, click the "Sign Up" or "Register" link, fill out your artist profile and use the "Upload" field to upload your songs.
Upload your songs to file-uploading sites if you just want to share them privately with your friends. Sites like RapidShare, Sendspace and YouSendIt allow you to upload files and share them only with the people you want. Just visit a site of your choosing and use the "Upload" form on the home page to select the song file(s) from your hard drive. Insert the email addresses of friends and family in the "Recipient" boxes and the server will generate an email to each of them, with a link to your downloadable file(s).
Upload your music for profit, by submitting to professional digital music retailers like Amazon, iTunes, and Rhapsody. Sites like CD Baby, Nimbit and TuneCore allow you to upload your music, obtain a legal UPC mode and acquire distribution with major retailers for a fee. Visit the different sites, compare prices and sign up with the best service for you.