R&B legend Etta James passed away Friday morning in Riverside, Calif., at the age of 73 after a long battle with leukemia. Bridging the gap between R&B, blues, jazz, gospel and rock 'n' roll, the singer made a name for herself in the '60s as the first major female star on Chess Records, and established her musical immortality with her indelible version of the pop standard 'At Last.' Upon news of her passing, rockers the world over took to Twitter to pay their respect, and below are a few of the things they had to say: