If the pop star dished up a great show, we say it was pyrotechnic, being like fireworks.
If she were caught lip-syncing or came on too stoned, it would be pyroclastic, being like rocks ejected from an erupting volcano.
Such is the power of a suffix. Another lesson from the Greeks.
IS IT ALL GREEK TO YOU?
PETER THE PROOFER WILL SAVE HOI POLLOI!