Open a new file in Garageband 

Set the tempo to around 133 BPM

Create a new track and select an Electronic Drum Kit sound (like a 909)

Create a new MIDI region and draw in a drum beat

• Four-on-the-Floor kick drum

• Snare or similar on beat 2 and 4

• Hi-hat on the off-beat

• Add other drum sounds to add interest

Loop your beat for at least four bars (upto bar 5)

Try the Quantise function to make your beat more interesting

Try varying the Velocity of some notes to balance the sounds

Choose a Chord Progression from the worksheet to use

Create a new track and select a synthesiser patch for the sound

Create a one-bar MIDI region and programme in the first chord from your progression

Then programme in the other chords into separate MIDI regions

Experiment with the Argegiator and sound until it fits.

Create a new track and select an appropriate synthesiser bass patch

Use the Root note from the worksheet (as shown above)

Use the rhythm shown on the right and explained in the video

Experiment with moving some notes to create more interest

Create a new track and this time choose a synthesiser sound that will stand out of your backing. 

Improvise using the keyboard over your chord progression, starting and ending on the root of Chord 1 from your progression until you have something that fits.

Record your riff onto this new track.