The diminished scale is another very interesting scale. It's a neverending repeating pattern of whole tone, half tone, whole tone, half tone etc. For this reason there are only two main scale positions, as opposed to the 5 positions of the pentatonic scale or the 7 positions of the major scale. It also sounds terrifying in a heavy metal solo and is great for working all 4 fretting fingers as you will see. I will now take you through the 2 main scale positions, and then I will show you 3 of my favorite diagonal shapes.
Whole-Half Diminished Scale
Starting on the 7th fret, try out the Whole-Half diminished scale. It's called this because from the root note, in this case B, we play a whole step ahead (2 frets) followed by a half step (1 fret) after that. This pattern repeats endlessly.
Half-Whole Diminished Scale
This is the second position and therefore starts on the second note of the first scale shape, the C#. This is the same idea as before but flipped around so that we begin with the root note, followed by a half step, followed by a whole step, and so on.
Because of the repetitive nature of the diminished scale, you can arrange your fingerings into really interesting diagonal shapes like this. This one is exclusively the "Whole-Half" fingering.
This one is exactly the same as before except instead of using the "Whole-Half" fingering on the B (7th fret), we will be using the "Half-Whole" fingering on the C# (9th fret)
Wide 2-nps Custom Diagonal
Here is a custom, wide, diagonal position which is a favorite of mine. It begins on the B (7th fret), skips the whole step and the half step to land on the fourth note. I then shift this pattern up and across diagonally. Wow what a sound!
Be sure to bust out these evil scales next time you encounter a heavy open E riffing breakdown!
Check out the video lesson below for the playthrough