Y'know, Bards can focus all of their skills to be a Class-lite. A lot of Arcane Knowledge, Spellcraft, Wands, and so forth, and they're Wizard-lite. Heal, Knowledge Religion, Knowledge (Outer Planes), a wand of Heal spells, Brew potion, Cleric lite. You can do this with Fighting and Roguery aswell.
Yes, you can be one of the classes, but the Bard is just a smattering of all these things. Take a heal spell, an artillery, a buff, get a sword, some roguery skills, whatnot.
As to the bards doing their singy thing... They don't have to. Or, you can work the descriptions differently. THey don't *have* to sing; they can speak. Generals, Coaches, Commanders, anyone in charge will give a speech to inspire, to whip everyone into a ferver, to influence the crowd, the comrad. Who says you have to strum a lute? Recount the ancestory of your clan, of the Dwarven wars, of the Atrocities of your enemies, to further spurn your fellows, so forth. You don't have to be Barry White.