The document discusses four major music institutions: Warner Music Group, Sony Music Entertainment, EMI, and Universal Music Group. Warner Music Group is the largest American-owned music conglomerate and owns labels like Atlantic Records. Sony Music Entertainment is the second largest in the global music industry and owns Columbia Records and RCA Records. EMI is the fourth largest record label and owns labels such as EMI Records and Parlophone. Universal Music Group is the largest music corporation in the world, operating as a subsidiary of Vivendi, and owns various labels including Interscope Records, Capitol Records, and Motown Records.