I purchased the new "Special Edition" of Dream Theater's A DRAMATIC TURN OF EVENTS.
In addition to the new CD, it included a DVD of the auditions of the seven drummers invited to replace Portnoy............those drummers were :

Aquiles Priester

Derek Roddy

Marco Minnemann

Mike Mangini

Peter Wildoer

Thomas Lang

Virgil Donati

All seven are outstanding in this 1-hour video.
The band had recognized three standouts and ultimately chose Mangini about a year ago.

This is an example of some very cool documentation on the part of the band; the DVD is well-done and enjoyable to watch -- you get a peek into the "business" of Dream Theater and also see a very personal side of a bunch of good people and top-notch musicians.
Highly recommended !