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John Petrucci talks about PARADIGM Strings - YouTube
Ibanez RG1527Z JPM P7 John Petrucci 7 strings | Reverb
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Here's How: John Petrucci's Open Strings Techniques | GC Riffs
John Petrucci quote: Real thick strings - your hands start to get fatigued...
John Petrucci Lesson: How to Play Movable Chords with Open Strings | Guitar World
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Picks & Strings - John Petrucci
Megadeth Guitarist Explains Why He's Not Really Into 7-Strings, Says He Likes John Petrucci More Than Buckethead | Music News @ Ultimate-Guitar.Com
Ernie Ball - John Petrucci's favorite guitar strings. - YouTube