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.