Here's a jam heavily based on Zappa's 'Watermelon in Easter Hay' which is just played over open A & E chords but with an interesting 9/4 time signature.... count 1-2-3-4 over the A chord and 1-2-3-4-5 over the E chord, and the slow Arpeggio is easy enough to work out. You should check out both Frank and Dweezil playing this to get an idea of what I'm trying (and failing) to do with those fast descending runs. Enjoy!