om bhur bhuvah svaha

reciting the gayatri mantra (considered by many, mother of all mantras) can be of great help in reaching inner calm before meditation practice ... it also fosters and sharpens our faculties

om bhur bhuvah svaha

tat savitur varenyam

bhargo devasya dhimahi

dhiyo yonah prachodayat

om, a similar sound as produced by the kinetic energy of planets and stars moving in the cosmos ..