Here's the 20min interview with John Petrucci done in Paris right before the Dream Theater concert at the Olympia on July 7th 2014.
Subjects discussed in the interview

His first guitar, his training, his influences
The recording of the last Dream Theater album
How it was composed and recorded
The details of the gear used on the record
His approach to a concert with G3 compared to with Dream Theater
His word of wisdom to progress

Pierre.

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