The document discusses four major music institutions - Universal Music Group, Sony Music Entertainment, Warner Music Group, and EMI Music Publishing. It provides details on when each was founded, their current size and revenue, sub-labels, and examples of popular artists signed to each. Universal is the largest, founded in 1934, with over $6.5 billion in revenue and artists like Taylor Swift and U2. Sony is second largest, founded in 1929, with labels like Columbia and Epic and artists like Michael Jackson and Alicia Keys. Warner is third largest and founded in 1958, home to artists like Coldplay, Ed Sheeran, and Prince. EMI was one of the "big four" labels until being acquired in 2012