Today, Jan. 20, news broke that blue and R&B icon Etta James had died at the age of 73. The legendary songstress, who is responsible for hits such as 'At Last' and 'Tell Mama,' passed away after struggling with leukemia and other health complications over the past few years. James left an indelible mark on music with her trademark vocals and soulfulness, and other artists that she impacted throughout her life immediately began to post mournful messages on their Twitter accounts. will.i.am, Jessie J, Hayley Williams of Paramore, Rachel Crow of 'X Factor,' and Harry Shum Jr. of 'Glee' all spoke about the passing of Miss Peaches and how much the vocal powerhouse will be missed -- read their tweets plus more below.