Though the major record companies dominate the American music industry, an independent music industry ("indie music") does exist. Most indie record labels have limited, if any, retail distribution outside a small region. Artists sometimes record for an indie label and gain enough acclaim to be signed to a major label; others choose to remain at an indie label for their entire careers. Indie music may be in styles generally similar to mainstream music, but is often inaccessible, unusual, or otherwise unappealing to many people. Indie musicians often release some or all of their songs over the Internet for fans and others to download and listen. In addition to recording artists of many kinds, there are numerous fields of professional musicianship in the United States, many of whom rarely record, including community orchestras, wedding singers and bands, lounge singers, and nightclub DJs. The American Federation of Musicians is the largest American labor union for professional musicians. However, only 15% of the Federation's members have steady music employment.