In lesson 28 you learnt about riffs (repeating rhythmic patterns of notes applied to chord progressions). Most riffs are created either from a scale or a combination of scales and arpeggios. The most common scale for creating riffs is the minor pentatonic scale. Pentatonic means five notes. In the A minor pentatonic scale these notes would be A C D E and G.
Play the scale ascending and descending as shown here. Try to get a smooth, even sound.
To help develop your picking it is a good idea to practice playing each note twice.
Here are some riffs derived from the A minor pentatonic scale. Memorize them and then try making up some of your own. The better you know the sound of the scale and the fingering, the easier this will be.
This 12 bar Blues shuffle riff in the key of A is also derived from the minor pentatonic scale. In the final bar, there is an extra note which comes from the Blues scale, which is discussed in later lessons. Notice the fingering in the second bar of this example. The second note of beat 3 and the first note of the triplet on beat 4 are both played with the 3rd finger. The first note is played with the tip of the finger and the finger is then flattened across towards the D string, so the second note can be played. This is a common technique, so it is worth spending some time practicing it.