One of my favorite ways to expand on the typical blues/rock/metal vocabulary is to introduce fast melodic bursts based on diminished-seven arpeggios. In this month's column, the focus will be on the E diminished-seven arpeggio, which consists of the notes E, G, Bb and C#. I like to challenge myself to find all possible ways to utilize this arpeggio up and down the fretboard in as seamless a way as possible.