genre blueprint 
___MASK26___ and roll ( often written as ___MASK26___ & roll or ___MASK26___ ' n ' roll ) is a genre of ___MASK5___ that originated and evolved in the United States during the late 1940s and early 1950s , from African - American ___MASK88___ styles such as gospel , jazz , boogie woogie , and rhythm and blues , with country . While elements of ___MASK26___ and roll can be heard in blues records from the 1920s and in country records of the 1930s , the genre did not acquire its name until the 1950s . The Hammond organ is an electric organ , invented by Laurens Hammond and John M . Hanert and first manufactured in 1935 . ___MASK79___ models have been produced , most of which use sliding drawbars to create a ___MASK20___ of sounds . Until 1975 , Hammond organs generated sound by creating an electric current from rotating a metal tonewheel near an electromagnetic pickup , and then strengthening the signal with an amplifier so that it can drive a speaker cabinet . Around two million Hammond organs have been manufactured . The organ is commonly used with , and associated with , the Leslie speaker . ___MASK91___ is a development of jazz incorporating strong influences from ___MASK68___ , soul , gospel and ___MASK100___ in music for small groups , often an organ trio featuring a Hammond organ . ___MASK68___ is a genre and ___MASK88___ form originated by African Americans in the Deep South of the United States around the end of the 19th century . The genre developed from roots in African ___MASK88___ traditions , African - American work songs and European - American folk music . ___MASK68___ incorporated spirituals , work songs , field hollers , shouts , chants , and rhymed simple ___MASK6___ ballads . The blues form , ubiquitous in jazz , rhythm and blues and rock and roll , is characterized by the call - and - response pattern , the blues scale and specific chord progressions , of which the twelve - bar blues is the most common . Blue notes ( or " worried notes "), usually thirds or fifths flattened in pitch , are also an essential part of the sound . ___MASK68___ shuffles or walking bass reinforce the trance - like rhythm and form a repetitive effect known as the groove . McKinley Morganfield ( April 4 , 1913  April 30 , 1983 ), better known as Muddy Waters , was an American ___MASK68___ musician who is often cited as the " father of modern Chicago ___MASK68___ ". ___MASK54___ is a fusion genre combining elements of blues and rock . It is mostly an electric ensemble - style music with instrumentation similar to electric blues and rock . From its beginnings in the early - to mid - 1960s , ___MASK54___ has gone through several stylistic shifts and along the way inspired hard rock , Southern rock , and heavy metal . ___MASK54___ continues to be an influence , with performances and recordings by several popular artists . William Rory Gallagher (; 2 ___MASK12___ 1948  14 June 1995 ) was an Irish ___MASK68___ and rock multi - instrumentalist , songwriter , and bandleader . Born in Ballyshannon , County Donegal , and brought up in Cork , Gallagher recorded solo albums throughout the 1970s and 1980s , after forming the band Taste during the late 1960s . He was a talented guitarist known for his charismatic performances and dedication to his craft . Gallagher ' s albums have sold in excess of 30 million copies worldwide . Gallagher received a liver transplant in 1995 , but died of complications later that year in London , UK at the age of 47 . The guitar is a ___MASK88___ instrument classified as a string instrument with anywhere from four to 18 strings , usually having six . The sound is projected either acoustically , using a hollow wooden or plastic and wood box ( for an acoustic guitar ), or through electrical amplifier and a speaker ( for an electric guitar ). It is typically played by strumming or plucking the strings with the fingers , thumb and / or fingernails of the right hand or with a pick while fretting ( or pressing against the frets ) the strings with the fingers of the left hand . The guitar is a type of chordophone , traditionally constructed from wood and strung with either gut , nylon or steel strings and distinguished from other chordophones by its construction and tuning . The modern guitar was preceded by the gittern , the vihuela , the four - course Renaissance guitar , and the five - course baroque guitar , all of which contributed to the development of the modern six - string instrument . An organ trio , in a ___MASK49___ context , is a group of three ___MASK49___ musicians , typically consisting of a Hammond organ player , a drummer , and either a ___MASK49___ guitarist or a saxophone player . In some cases the saxophonist ___MASK30___ join a trio which consists of an organist , guitarist , and drummer , making it a quartet . Organ trios were a popular type of ___MASK49___ ensemble for club and bar settings in the 1950s and 1960s , performing a blues - based style of ___MASK49___ that incorporated elements of R & B . The organ trio format was characterized by long improvised solos and an exploration of different ___MASK88___ " moods ". Blueprint is the third album by Irish guitarist Rory Gallagher , released as a vinyl record in 1973 . With his first band Taste and with his solo band up to this point Gallagher was one of the first guitarists to lead a power trio lineup . With Blueprint Gallagher included a keyboardist for the first time . A power trio is a ___MASK26___ and roll band format having a lineup of guitar , bass and drums , leaving out the second guitar or keyboard that are used in other ___MASK4___ quartets and quintets to fill out the sound with chords . While one or more band members typically sing , power trios emphasize ___MASK89___ performance and overall impact over vocals and lyrics . History . The rise of the power trio in the 1960s was made possible in part by developments in amplifier technology that greatly enhanced the volume of the electric guitar and bass . Particularly , the popularization of the electric bass guitar defined the bottom end and filled in the gaps . Since the amplified bass could also now be louder , the rest of the band could also ___MASK35___ at higher volumes , without fear of being unable to hear the bass . This allowed a three - person band to have the same sonic impact as a large band but left far more room for improvisation and creativity , unencumbered by the need for detailed arrangements . As with the organ trio , a 1960s - era soul jazz group centered on the amplified Hammond organ , a three - piece group could fill a large bar or club with a big sound for a much lower price than a large ___MASK26___ and roll band . A power trio , at least in its ___MASK54___ incarnation , is also generally held to have developed out of Chicago - style blues bands such as Muddy Waters ' trio .