[2] Work songs and field hollers provided a mode of expression for enslaved people to challenge the oppressive structures of white power.
[2] Louis Armstrong is often cited as being a large contributor to the rise in popularity of vocal jazz music, beginning in the late 1920s.
Notable singers of this period were Ella Fitzgerald, Sarah Vaughan, Billie Holiday, and Dinah Washington who had all previously sung with big bands and developed their solo careers.
This period gave rise to Peggy Lee, June Christy, Chris Connor, Helen Merrill, Chet Baker, Carmen McRae, Joe Williams, and Ray Charles.
[5] The microphone technique is a big part of vocal jazz singing, allowing vocalists to amplify their voices with certain phrases.