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The first appearance of the blues is often dated to after the ending of slavery, with the development of juke joints occurring later. It is associated with the newly acquired freedom of the former slaves. Chroniclers began to report about blues music at the dawn of the 20th century. The first publication of blues sheet music was in 1908.
British blues emerged from the skiffle and folk club scene of the late 1950s, particularly in London, which included the playing of American acoustic blues.Critical was the visit of Muddy Waters in 1958, who initially shocked British audiences by playing amplified electric blues, but who was soon performing to ecstatic crowds and rave reviews. [30]
Some bass amps have a 15 or 20 dB pad which can be used to attenuate "hot" signals, such as basses with an internal preamplifier (depending on the model of amplifier, some brands may provide two inputs (high and low gain) instead of providing a "pad". This pad can be turned on using a button. Some bass amps have an even stronger pad, a 40 dB pad.
The Marshall Bluesbreaker is the popular name given to the Models 1961 and 1962 guitar amplifiers made by Marshall from 1964/65 to 1972.. The Bluesbreaker, which derives its nickname from being used by Eric Clapton with John Mayall & The Bluesbreakers, is credited with delivering "the sound that launched British blues-rock in the mid-1960s."
Fender Silverface Bassman amp AB165 amplifier, with a 2×15" speaker cabinet. The Fender Bassman is a series of bass amplifiers introduced by Fender during 1952. [citation needed] Initially intended to amplify bass guitars, musicians used the 5B6 Bassman to amplify other instruments, including electric guitars, harmonicas, and pedal steel guitars.
The Hot Rod DeVille is a modified version of the earlier Fender Blues DeVille from the Blues amplifier line and has a higher level of gain in its preamplification signal. The DeVille incorporates a 60 watt amplifier and has been offered in two different models: a 212 , with 2, 12-inch speakers and a 410 , with 4, 10-inch speakers.
Eight-bar blues progressions have more variations than the more rigidly defined twelve bar format. The move to the IV chord usually happens at bar 3 (as opposed to 5 in twelve bar); however, "the I chord moving to the V chord right away, in the second measure, is a characteristic of the eight-bar blues."