Tapping the Singing Stones
There is a quest that says "Tap the singing Stones" 0/8. I've placed all of the stones & tapped each one. I've even tapped "Do it" first both with Homer being clear of a task and with him on a task. Nothing seems to happen aside from the musical notes playing from the stones. The task remains at 0/8. Any ideas on how to advance/finish this task?