The rockers we've lost in 2015 include a number of great artists and important contributors. They range from early rock 'n' roll pioneers and key industry figures to trusted members of bands that helped shape rock music as we know it. The year started with the sad news that Irwin Steinberg, a legend at the Mercury and Polydor labels, had died. Legendary musicians -- including Lemmy Kilmister, Scott Weiland, influential writer and producer Allen Toussaint, Toto's Mike Porcaro, B.B. King, Yes' Chris Squire and REO Speedwagon's Gary Richrath -- were also among those who passed away. Look for brief tributes to the Rockers We've Lost in 2015 in the above photo gallery. May they all rest in peace.