Zen, yes, there are instructions.
There is a brief warm-up (I do more warm up than theirs), but during warm up the workout is described a bit so you know what is coming...also a little instruction about spinning a high cadence.
Then, there is music (edited to add...wait...is there music with this one? I can't remember!), with voice-over guiding you through the interval session: timing the intervals, giving instruction as to what cadence, giving tips on retaining form throughout the interval, and also giving encouragement.
They also remind you to take a drink of water during the rest periods after some intervals, etc.
"The best rides are the ones where you bite off much more than you can chew, and live through it." ~ Doug Bradbury