The Atlantic Records founder, Rock and Roll Hall of Fame member, and all-around music industry legend fell and hit his head at a private Rolling Stones show in October, and never recovered. He was 83. The Guardian has a comprehensive obit; they open with this:

The word “legend” is liberally bandied about in the sphere of popular music, but it is a term which can truthfully be used to describe Ahmet Ertegun, the co-founder of Atlantic Records. Ertegun’s death, at the age of 83 following a fall, severs a vital link to some of the most significant chapters in the development of soul, rhythm & blues and rock. He helped to discover or nurture many of the most influential musicians of the last half century, including Ray Charles, Aretha Franklin, The Drifters, Wilson Pickett, Percy Sledge, Bobby Darin, Cream, Led Zeppelin, Crosby Stills & Nash and the Rolling Stones.

Wikipedia points out that this Ahmet is why Zappa named his kid Ahmet.