The sound vibration of the Hare Krishna mantra, although presented in the ordinary alphabet, should not be taken as mundane or material.
Srimad bhagavatam 4.9.4,
Material world is like a dream.
Everything in Material world is temporary.
False Happiness in the material world is the source of distress.
This material world is actually meant for misery, just as a prison house is meant for punishment.
Material world brings pleasure and miseries.