siren

[Saseal]

Agreed with the majority here - I love Pharos' BGM. It's one of the few I don't play my own music over (that, and Ramuh/Titan/Shiva/Ultima/Garuda and WoD... but thats about it).
The opera-esk SFX she does in mid-fight is a bit odd to me, but I would think it's hard to sing beautifully for any length when you have a bunch of people smacking and blowing you up... xD;
j/k probably has to do with wanting to keep the sound bytes brief and easy to hear. Make it sound too eerie and it sounds too much like the dungeon BGM's chorus. Which can easily be taken as her haunting singing from the top of the tower, echoing down throughout it.
The pick-up of the melody is the part I love the most - like an epic to get to this dangerous but beautiful creature.

I will agree with the fight itself, though - it is a bit underwhelming compared to the mood of beautiful danger the dungeon music sets. Mechanics-wise, same with Fenrir..... especially Fenrir. There's more pattern to his fight than plaid. ~_~ His mechanics felt lazily or uncreatively planned.
Diablos was at least unique with the doors (that is, before people learned/geared to mechanic-ignore them.... I still mark them when I heal that dungeon, though) the other two..... not so much.

The bird part of her design... yeah, not a fan of her 'hair' (and not particularly a fan of those particular parrots. Too unpredictable for me. I'll take my conures). They would probably be better off designing her after a canary (since they're typically thought of as 'signing like a canary').