[1] The Upanishads are the philosophical essence of the Vedas.
[2] Translation by Dr. S.Radhakrishnan in his book “The Principal Upanishads”.
[3] See “The Selfish Gene” by Richard Dawkins.
[4] Dr. H.S. Gill in his essay ‘Shabad : An Invocation’ in the book “Sabda” edited by S.K.Sareen & M.Paranjape published by Mantra, Delhi, 2004
[5] Brihadaraanayak Upanishad – I.3.26
[6] “A Critical Study of Sanskrit Phonetics” by Dr.V.Mishra – Chowkhamba Sanskrit Series, Varanasi, 1972
[7] “Shatpath Brahmana – Vigyanbhashyam” Vol. I – by Pt. Motilal Shastri – published by Rajasthan Patrika, Jaipur,India – 1988
[8] The full names are shadaj, rishab, gandharva, madhyam, pancham, dhaivat, nishad
[9] “ Sangitratnaakar ” – (2 Vol.) – by Subhadrā Chowdhry – pub. by Radha Publications, Delhi – 2000
[10] “Shiva Sutras” translated by Jaideva Singh
[11] Literally ‘unheard-sound’.
[12] All this is explained in the first shloka of “Sangitratnakar” – (Vol. I) cited above.
[13] Brihadaranyaka Upanishad III.8.8 to 12
[14] “Four Quartets” by T. S. Elliot
[15] Introduction of – “The Principal Upanishads” by S.Radhakrishnan