Record two tracks using garage band

1. Chords or bass line (chord roots)for D Blues

D | D | D | D |

G | G | D | D |

A7 | G | D | A7|

2. Soloing with the D Blues scale

(you can switch directions at any time, skip notes, hold out notes, change the rhythm, anything you can think to do with the blues scale. Make it sound good to you.

If you feel like it, you could try to record the chords on guitar or ukulele or keyboard.