Ganapatiatharvashirsha is about lord Ganesh. It is a part of Atharveveda. Time frame of Atharvaveda is around 1500BC to 500 BC. Gana means group and esha means lord. Ganesh means lord of groups. There are various groups mentioned in Ganapatiatharvashirsha that are owned by lord Ganesh. The groups include ‘Tridevas’ (Bramha, Vishnu and Mahesh), ‘Panchamahabhutas’, expressions of self (Ananda, Bramha(Sat), Chit), Shakti (creation, prevention and destruction), Kala(past, present, future), Guna (Satwa, raja, tama), directions, deha, Varnas (letters), speech, and so on. Om is also a representation of lord Ganesh. Om is a verbal representation of the god. It is ‘Sagun’ (with qualities) but Nirakar (formless) representation of god. NASA released audio form of sound of universe few years back. Plasma waves were converted into human audible waves. You may hear these sounds here . If you know the sound of OM, you might realize that the sound of universe is ve