What the hell is a double-picked arpeggio? I'm sure there's a better name for it, but it's when you play a simple one note per string arpeggio, but hit each note twice. An easier version is picking every note four times (easier to control string changes at high speed) and a harder version is picking every note three times (uneven note count means you'll alternate changing strings on a downstroke and then an upstroke, as with regular alternate-picked one note per string arpeggios). This is one of my favorite sounds. It has an aggressive percussive effect to it while maintaining simplicity and clarity of melody. It's also very fun to play as you get some of the pendulum feeling of alternate picking arpeggios, but with pauses in movement to hit the second note before changing strings. You probably know this one. Beginning and end of song. Has a few groups of four. The entirety of the heavy part starting at 3:20. Around 2:40 in and continuing. Groups of sixes in the beginning. I find this kind of thing is a great right-hand warm-up. Doesn't require much thought so you can easily read or watch something on the PC while warming up without boring yourself with more common warm-up exercises.