*The Chicago blues is a form of blues music that developed in Chicago, Illinois by adding electrically amplified guitar, drums, piano, bass guitar and sometimes saxophone to the basic guitar/harmonica Delta blues. The music developed mainly as a result of the "Great Migration" of poor black workers from the South into the industrial cities of the North such as Chicago in particular, in the first half of the twentieth century.
Chicago Blues has a more extended palette of notes than the standard six-note blues scale; often, notes from the major scale are added, which gives the music a more "jazz feel" whilst still being in the confines of the blues genre. This is not, however, as prominent as Texas blues, which contains many other notes such as the major 3rd and major 6th. Chicago blues is also known for its heavy rolling bass.
Another notable point is that Chicago blues contains many dominant 9th chords, and the scales usually contain 9th notes. Note that a 2nd is the same as a 9th (the notoriously confusing '9=2' seen on many chord charts reflects this fact), and this is especially emphasized on guitar, on which it is much more difficult to span octaves, than on a piano.
*The Memphis blues is a style of blues music that was created in the 1920s and 1930s by Memphis-area musicians like Frank Stokes, Sleepy John Estes, Furry Lewis and Memphis Minnie. The style was popular in vaudeville and medicine shows, and was associated with Memphis' main entertainment area, Beale Street. The history of the era is detailed in the early chapters of a 2000 book by James L. Dickerson entitled Goin' Back to Memphis ISBN 0815410492.
Some musicologists believe that it was in the Memphis blues that the separate roles of rhythm and lead guitar were defined. This two-guitar concept has become standard in rock and roll and much of popular music.
In addition to guitar-based blues, jug bands, such as Gus Cannon's Jug Stompers and the Memphis Jug Band, were extremely popular practitioners of Memphis blues. The jug band style empasized the danceable, syncopated rhythms of early jazz and a range of other archaic folk styles. It was played on simple, sometimes homemade, instruments such as harmonicas, violins, mandolins, banjos, and guitars, backed by washboards, kazoo, Jews harp and jugs blown to supply the bass.
After World War II, electric instruments became popular among Memphis blues musicians. As African-Americans left the Mississippi Delta and other impoverished areas of the south for urban areas, many musicians gravitated to Memphis' blues scene, changing the classic Memphis blues sound. Musicians such as Howlin' Wolf, Willie Nix, Ike Turner, and B.B.King performed on Beale Street and in West Memphis, and recorded some of the classic electric blues, rhythm and blues and rock & roll records for labels such as Sun Records. These musicians had a strong influence on later musicians in these styles, notably the early rock & rollers and rockabillies, many of whom also recorded for Sun Records
· 1 decade ago