Slow blues amble along at 70 beats-per-minute or less, giving ample time to switch to the IV-chord in bar two, before two more bars of I-chords in bars three and four. In bars five and six, switch again to the IV-chord, before going back for two more bars of I-chords in bars seven and eight. Then descend from a bar of V-chord in bar nine, to a bar of IV-chord in bar ten, to a two-chords-per-bar "turnaround" in the last two bars. In bar eleven, play a I-chord for two beats followed by a IV-chord for two beats, then in bar twelve play a I-chord for two beats followed by a V-chord for two beats.
