Group play is mandatory at lvl 10-12 and beyond, so dont think that would work else u have to spend lots of time lvling a right sub

THF would be good with NIN and maybe SAM for TP boosts, but wont work at all with BRD. Not to mention THFs are one of the toughest to lvl up since you dont do extremely lot of dmg before lvl 15's Sneak Attack and therefore wont be invited to many parties and have trouble with solo play. THFs are WICKED later on, but for early play its hard.

BRD/WHM is the only real way to play it the most effectively. You also have to move around alot choosing the right songs to sing and also recast them when the one or two minute effects of the song is up, not to mention support with heals, you are there to support, nothing else.