Battle Chant (ability)

Battle Chant, also known as Battle Song, is a recurring ability in the Final Fantasy series. It is usually part of the Sing skillset, and powers up allies in some way, usually by raising their Attack or Defense.

Final Fantasy Tactics
The Bard can use Battle Chant as a Bardsong ability. It increases the physical attack power of allies.

Final Fantasy Tactics A2: Grimoire of the Rift
Bards can use Battle Chant. It has a Range of 4, and raises the defense of an ally.