The Astonishing is undisputedly the most ambitious undertaking by a band whose cerebral compositions already define the vanguard of progressive hard rock. It is enriched exponentially by the integration of a real orchestra and choir, arranged by conductor David Campbell, whose work includes watershed releases from Adele, Justin Timberlake, Linkin Park, Evanescence, Beyoncé, and his son, Beck. The Astonishing was produced by Petrucci with engineering and mixing by Richard Chycki, whose resume includes work with Rush, Aerosmith, and Mick Jagger. Other organic sounds are more abundant than at any point in the band’s history, with Rudess in particular relishing the tones from a grand piano and Hammond organ.