The document discusses the "Big Four" major record labels in the music industry: 1) EMI was formed in 1931 and was famous for its "His Master's Voice" label and is now the fourth largest record label group. 2) Warner Music Group has over 4,000 employees and works in both music and other entertainment. It is home to many influential artists. 3) Universal Music Group is the largest record label group and has the largest market share with global operations. 4) Sony BMG Music Entertainment was formed through a joint venture between Sony Music and Bertelsmann Music Group in 2004 and owns many record labels.