You are constantly surrounded by a faint aura of Bardic Music, and it benefits you and your nearby allies in combat. You and all nearby allies receive the benefits of Inspire Courage as long as you are alive and not incapacitated. Certain Bard feats and abilities can alter or increase the benefits of your Ballad.
Notes
Description in the game states that the Ballad only lasts one minute. This is the length of the buff applied per refresh interval, which occurs ~10 seconds at a time. This is only important to note if a party member wanders outside the Ballad range, or if the Bard dies.
The range on the ballad appears to be 30 in-game meters centered on the bard. Level 18 Warchanter core ability Victory Song doubles the range.
The in-game description says Aria; however, this is a leftover typo from the original testing name of the ability from its time on Lammania.
Allies and yourself benefit from +20 Temporary Hit Points, +3 Physical Resistance Rating, an +10 Healing Amplification as long as you are not incapacitated and they are within the Ballad.