Sinewy Etude

Sinewy Etude, also known as Aiding Anthem, is a recurring ability in the Final Fantasy series. It usually increases the party's physical attack strength, and is used via the Sing command.

Final Fantasy V
Sinewy's Etude is one of the Bard's initial songs. It raises the party's Strength.

Final Fantasy XI
Sinewy Etude is one of a series of Etude songs usable by the Bard. It raises the party's Strength. The stronger Herculean Etude has increased potency.

Final Fantasy Dimensions
Aiding Anthem is the Bard's first song learned. It restores HP to the party while the Bard sings.

Theatrhythm Final Fantasy
Sinewy Etude raises the party's Strength depending on the ability's level, giving +15 Strength at Level 1, +20 for Level 2, and +25 at Level 3. Sephiroth, Zidane and Lightning learn all three levels of Sinewy Etude, while Princess Sarah learns the ability's Level 2 and Level 3 forms