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... slide effect was also used on the banjo. Later when Blues became more popular and moved north singers were accompanied by jazz instruments like the trumpet, trombone, clarinet, piano and contrabass. With the increased popularity of blues and the variety of instruments that played in the blues orchestra some instrumental problems were encountered and their solutions lead to advances in blues instrumentation, for example the resonator guitar was designed to balance the volume of the guitar when playing with wind and brass instruments but due to its distinctive "blues" sound was used even after electronic amplification solved this problem. The most common structure in blues is the 12 bar blues. It uses a twelve bar pattern and is in common time. It uses chords 1, 4 and 5 or the tonic, subdominant and dominant respectively. The chords are repeated through out the song in this pattern: Bar - 1 2 3 ...