The music industry has been dominated by four major multi-national corporations;
"Majors"
Universal
Sony Music
Warner Brothers
EMI
They referred to as the "majors," because they generate the most money.
Most "majors," own or licence a series of smaller subsidiary so different audiences are recachd in a variety of genres.
Major "independent"
Columbia
Island
Syco
RCA
Virgin
There are various number of small companies
They tend to concentrate on specialised artists or groups who are specialised niches within the industry
An example of a successful independents -> Domino Records