With the exception of the Damage and Destruction in Realms - an account of Julius Caesar, his wars and his death - they are all in verse and extremely multifarious - narrative, devotional hagiological, philosophical and scientific, allegorical and moral, historical, satirical and occasional.
The neuter term brahma is used in the Rigveda both in the abstract sense of "devotion, worship," and in the concrete sense of "devotional rite, prayer, hymn."
The Brahman priest (brahma) being thus the recognized head of the sacerdotal order (brahma), which itself is the visible embodiment of sacred writ and the devotional spirit pervading it (brahma), the complete realization of theocratic aspirations required but a single step, which was indeed taken in the theosophic speculations of the later Vedic poets and the authors of the Brahmanas (q.v.), viz.
Brahma), in the sense of "sacred utterance or rite," in which case it might mean a comment on a sacred text, or explanation of a devotional rite, calculated to bring out its spiritual or mystic significance and its bearing on the Brahma, the world-spirit embodied in the sacred writ and ritual.
It is loosely used to describe any exalted strain of devotional melody.