In plain words
The first of these is the Rigveda. It is divided into ten maṇḍalas. The first nine maṇḍalas contain hymns concerning deities such as Agni, Indra, Marut, and Uṣas. Historians have offered various kinds of evidence about how these Ṛk-verses came to be composed. In that era, the Rigvedic people regarded deities such as Agni and Vāyu as more exalted than themselves, recognizing that these distinguished deities possessed powers far beyond those of mortals — and it is for this very reason that they described the deities' qualities in such special detail. Next comes the second Veda, the Yajurveda. It has two branches, called the Kṛṣṇa Yajurveda and the Śukla Yajurveda. This Veda also describes the banks of the river Ganga, and it is in this very Veda that the subject of Uttara-mīmāṃsā is likewise clearly set out.
Even by that early time, life had come to be divided into forest-dwelling and village life, and people lived in villages. There is also another basis for this way of dividing the Yajurveda: it is divided into seven kāṇḍas, and within it the portion called the Āraṇyaka — that is, the portion that must be studied only in the forest — by its very instruction to that effect makes plain the division just described, between village and forest. The third Veda is the Samaveda. In this Veda, many of the Ṛk-verses already given in the Rigveda are rendered with svara; for this reason the Samaveda is centred on musical tone. This Veda is later in date than both the Rigveda and the Yajurveda. The Āryans, who in the Rigvedic period had dwelt on the banks of the Sindhu, had by the time of the Yajurveda moved on to the banks of the Ganga.
Scholars have held that in the period of the Samaveda the Āryans had spread into the middle region of Bharat. This Samaveda is also known by the name Gānavēda, 'the Veda of Song.' All the many kinds of music found in the world have developed by taking this Sama-chanting as their foundation. The Samaveda is the very root of song and chant; every musical note there is finds itself contained within it.