Sixteen-bar blues is a blues chord progression very similar to the eight bar blues form, except that blues is not traditionally associated with any set notation so sometimes it can be called sixteen bars instead of eight. The blues is a vocal and instrumental form of music based on a pentatonic scale and a characteristic twelve-bar chord progression. ... A chord progression (also chord sequence and harmonic progression or sequence), as its name implies, is a series of chords played in an order. ... An eight bar blues is a typical blues chord progression, taking eight 4/4 bars to the verse. ... Music notation is a system of writing for music. ...