The minor 7b9th arpeggio consists of the chord tones root (1), minor third (b3), fifth (5), minor seventh (b7) and minor ninth (b9) which correspond to the notes A, C, E, G and Bb in the key of A minor. This structure resembles the Phrygian scale (without the fourth and sixth degree), which explains the slightly exotic sound of this arpeggio.
Typical for the Phrygian mode is the half step move from the fundamental A to the second degree B (b2/b9), which is often found not only in Spanish music but also in Heavy Metal. To illustrate this, the simple chord progression | Am | Bb | is used here in order to leave enough room for the unique tension of the m7b9th arpeggio.
The minor 7b9th arpeggio exercise is included in the Guitar Lovers Studies PDF or as play along track in the Jamtracks PDF which feature high graphic resolution for printing and integrated sound.