Singing too has evolved, and soprano singers reach their piercing high notes by precisely controlling the shape of their vocal tract to match its natural, resonant frequency with multiples of the one being produced by their vocal folds.
After Terrors striker David Goodwillie had dinked the ball under Saints' Peter Enckelman for the opening goal after an hour of play, St Johnstone's chances of restoring parity were hampered by the frequency of stoppages for injuries in the final quarter of the match.