See generally Richard Seaford in OCD(3) 158 [now OCD(4) 152], under Arion [Author, Myth](2).
[1] On the E. Aegean island of Lesbos; cf. mu 898.
[2] cf. kappa 2643.
[3] 628-625 BCE. The words have also been interpreted to mean that "he flourished in the 38th Olympiad."
[4] For whom see alpha 1289, alpha 1290.
[5] Adler's '2' verses is corrected in her addenda and corrigenda
[6] Literally, "to set up a chorus". Pickard-Cambridge [p.97] translates "first composed a stationary chorus" and he notes on p.11 that "in late authors it means to 'make a chorus sing a stasimon'."
[7] Compare Herodotus 1.23 [web address 1]: Arion "was the first man we know to have composed the dithyramb and given it a name." According to Pickard-Cambridge [p.12 cf. Campbell pp. 11-12] the implication is that Arion made the chorus sing "a regular poem, with a definite subject from which it took its name," and not that Arion invented the name "dithyramb".
[8] The object 'omega' is an early editorial supplement omitted by Adler but incorporated by Bekker. The Suda frequently uses fula/ttei by itself to mean "keeps omega in the oblique cases."