Those who can, bard.
The bard is a pivotal character in any party. Not confined to a single role, bards can bring melee damage, spells, cures, and Ability increases to a party in Dungeons & Dragons Online: Stormreach (DDO):
Jacks of all trades--masters of none. At the risk of boring you with a cliche, it's true: bards can dabble in almost anything, but another class will be better than them in any one task. Bards can fight, but rangers, fighters, and barbarians can do it better. Bards cast spells, but sorcerers and wizards do it better. Bards can heal, but clerics do it better. Bards can fight and cast spells and heal all at once. Nobody else can do that. On top of that, the benefits gained from bardic music makes a bard a valuable member to any party.
Read more about the versatile bard at DDO - TenTonHammer.