Sona needs utility scaling buffs

Her utility, aside from her ult, is pretty subpar.

Song of Celerity is simply too weak; Lulu's single target speed buff is far superior. I know Sona can't have the same amount of speed because she can buff 5 people instead of one, however in terms of tactics a massive speed boost on a key champ is more useful than a mediocre 1.5s teamwide speedboost. Talisman offers better utility than this skill at max rank.

The powerchord effect (Tempo) should also be buffed to 3 seconds; tenacity makes the 2 seconds nearly worthless.

Aria of Perseverance should be buffed in that if there is no allied champ nearby, the heal and armor/MR buff should be doubled on her. The powerchord effect should be buffed to have much greater AP scaling; this would give Sona a late-game purpose besides an ult-bot

I would also review her Q range, since it does not appear to target champs at the 700 stated range.