What is a backing track for guitar?
A backing track is an audio recording on audiotape, CD or a digital recording medium or a MIDI recording of synthesized instruments, sometimes of purely rhythmic accompaniment, often of a rhythm section or other accompaniment parts that live musicians play along with or sing along to.
What is a blues shuffle?
The blues shuffle is a beat based on swinging eighth-note triplets. It should sound like four sets of train wheels bumping along the rails. To play a shuffle, give the triplets a swing feel: ONE two-three, TWO two-three, THREE two-three, FOUR two-three. The shuffle stems from early slave dances.