Brihatsama – Songs of Sama Veda, consisting of various tunes and meters which require long and enduring practice to sing. Of all the meters in Sama Veda, the meter called
`Brihati’ is the most difficult one and the songs composed in this meter are called
`Brihatsama’.

Gayatri – This meter is the most divine and powerful. The hymn composed in this meter (Om Gayatri Mantra) which glorifies the sun is recited every morning and evening by all. The Supreme is indicated in the Gayatri Mantra as All-pervading, Omniscient and Eternal. He who understands Gayatri in this way attains full and unending prosperity.

Margashirsha – End of hot season and beginning of cold.

Spring – Flowery season with all colors, beauty and charm around.

The commentary on this verse and the rest, is avaialble for free as:
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I am tatha, also; the Brhat-sama, the foremost samnam, of the Sama-mantras. Chandasam, of the metres, of the Rk-mantras having the metres Gayatri etc.; I am the Rk called Gayatri. This is meaning. Masanam, of the months, I am Marga-sirsa (Agrahayana, November-December). Rtunam, of the seasons; kusumakarah, spring.