Bards have Aspects of Attack and Support.
Bard's main resource is his tempo.
The Dissonance skill increases the tempo, while his other skills decrease it. Mostly, tempo is spent on the Solo skill, which boosts etudes played after it, and allows them to inflict more damage.
Etudes boost each other too: Dancing Blade boosts Singing Blade, which, in its turn, boosts Flying Blade. At the end of the sequence bards may instantly use the Crescendo skill that will inflict increased damage.
Bards should remember to use Dissonance at the right moments to increase their tempo. Increasing their tempo will allow them to inflicts more damage.