Song Fight! is a weekly online songwriting and recording competition in which amateur artists are openly invited to participate. Traditionally, a title and deadline are posted each week for which participants write, record, and submit a song in MP3 format. All entries are compiled at the end of the week and links to the files are displayed on the front page for public voting, which lasts until the end of the next week. All visitors to the site are able to listen to the MP3s and are permitted one vote each. At the end of this voting period, results are posted and the next cycle (or “fight”) begins, meaning at any given time one fight is in the works (in that a deadline and title are available) while the previous fight is in its voting stage. While the original Song Fight! system involved only one fight per week, as many as four are now sometimes conducted. Winning (especially repeatedly) earns you no more or less than “bragging rights, satisfaction, [and] the jealous glances of strangers sitting next to you on the subway.”
Nonetheless, the site has inspired well over a thousand artists to enter since the competition’s inception.All songs submitted to Song Fight! are free for download and are catalogued and hosted indefinitely
You can read how this whole Carpenters Fight thing got started here.