The wide variety of songs available to Bards allows them to do almost any role available in a group, with the exception of the role of main healer. While Bards do have a few healing spells, the amount that is granted simply isn’t radical enough to keep a tank alive, especially later in the game.
Many times in groups, Bards are expected to play the role of Enchanters. They are required to use their mesmerizing spells to enthrall any extra creatures pulled to the group until the group is ready to handle them. This isn’t a Bards forte, as a bad resist could easily spell the death of the Bard. They are also formidable damage dealers and have the ability to dual wield. Coupled with their powerful haste and attack enhancement songs, and later their spell enhancement songs, Bards can magnify the damage dealt by a group significantly, and is the main role of Bards.
Where a Bard truly excels though is kiting. Kiting is the technique of running with an enemy trailing closely behind, while simultaneously killing that enemy. Bards are able to twist a song to increase their movement speed while decreasing their enemies movement speed and yet another song to deal damage to the enemy. Talented and skilled Bards can kill up to twenty mobs at one time, though this takes a high amount of practice and skill.