I swear this is one of my favorite abilities in the entire series. You learn it with merely 20 AP - 10 for Perfect Pitch and then 10 for Matador's Song itself - and it utterly destroys all enemies that use attacks that can miss.
In case you didn't know, Matador's Song gives "Evasion +10" to your party. What does that do? It increases your evasion chance by 100%. I am so not even kidding. It literally does that. Meaning unless your evasion chance was below 0% before, the enemies are not going to hit you. Like, ever. And it does that to the entire party.
The Songstress is a pretty underrated dressphere in FFX-2. Apart from Matador's Song it also has the capability of completely incapacitating the entire enemy party with Sleepy Shuffle or other Dances, not to mention it gets Magical Masque deep in Chapter 5 which is one of the best abilities in the game, making your entire party completely impervious to all magic. Combine that with Matador's Song and you got yourself a damn useful class.
Discuss the awesomeness of the Songstress.