Guess who said it?

"So I say now that there are eight rhythmic modes (alhan = melodies), to each are [associated] measures of combinations of beats (tanghlm).

As for the first of them, its measure is three consecutive beats (naghamat), and one quiescent.

And the second, [its measure] is three consecutive beats and one quiescent, and one moving. Those two modes stir the humor of the blood and the temperament of sovereignty and dominion.

As for the 'iqacat [rhythmical modes], which constitute the genres of [i.e. from which derive] all the rhythms, they are divided into eight modes, and they are: al-thaqll alawwal, al-thaqll al-thani, almakhuri, khafif al-thaqll, al-ramal, khaftf al-ramal, khafif al-kbafif, alhazaj.

As for the al-thaqll al-awwal, it is three consecutive beats (naqarat mutawaliyat), then a quiescent beat, then the rhythm returns as it began.

Al-thaqil al-thani is three consecutive beats, then a quiescent beat, then a moving beat, then the rhythm returns as it began.

And the third, its measure is two consecutive beats-there is not between them the tune of a beat-and one quiescent, and between putting down and raising up [and raising up] and putting down is the time of a beat. And this mode alone moves [the humor of] the yellow bile, [the temperament of] courage and audacity, and what is like them.

Etc. (the full quote takes up too much space)

Who said it?

The prize: my admiration for knowing it. ;)