Boogie is a repetitive, swung note or shuffle rhythm,[2] "groove" or pattern used in blues which was originally played on the piano in boogie-woogie music.[citation needed] By the 1930s, Swing bands such as Benny Goodman, Glenn Miller, Tommy Dorsey and Louis Jordan all had boogie hits.Boogie-woogie is a style of blues piano playing characterized by an up-tempo rhythm, a repeated melodic pattern in the bass, and a series of improvised variations in the treble.Swing big band audiences expected to hear boogie tunes, because the beat could be used for the then-popular dances such as the jitterbug and the Lindy Hop.The Delmore Brothers "Freight Train Boogie" shows how country music and blues were being blended to form the genre which would become known as rockabilly.