You may be able to get away with that kind of thing at lower levels when "traditional" subs don't offer you very much you don't already have. Past a certain point, though, other subjobs are much better.
/BRD is usually not a great option because, in addition to only getting one song, your skill, which affects most buffs as well as debuffs, is extremely low due to not having an instrument.
There have always been those rare parties with unconventional setups that were amazing, and you'd fit right in. However, unless you have an exceptional party or several sources of refresh (and 99% of the time you will have niether) , you might have trouble keeping up with your party's MP demands.
Here's a quick comparison of BRD and two common low level subs (BLM, SCH) between levels 1 and 50 (since you are only leveling WHM as a sub) to help you decide:
MP difference: BRD offers the least MP; BLM offers the most. The difference in MP between these two subjobs ranges between 7 and 54 for the first 50 levels.
Spells: I'm guessing you know the BRD spells, since you've considered it already. BLM each come with a few black magic-based enfeebles. SCH doesn't offer many spells WHM doesn't already have that you would actually use at this level.
Traits: BRD gets resist silence. BLM gets conserve MP. SCH has resist silence and conserve MP.
Abilities: BRD and BLM get nothing useful. SCH gets Light/Dark Arts (increases skill and decreases MP cost, casting and recast time for white or black magic while doing the opposite for the other), Penury/Parsimony (reduced MP cost for next spell), and Celerity/Alacrity (reduced casting and recast time for next spell). These traits alone make SCH one of, if not the best subjob for WHM from level 20 onward. The bulkiness of this subjob takes some getting used to, but also might break up the monotony of cure botting.
Personally, my recommendation for parties is /BLM until level 20, and /SCH afterwards. /RDM has its uses after 80, but many people still prefer /SCH. I would too if I could ever be bothered to remake my macros for it. Play around in your teens with funky setups if you want, but in the long run, traditional setups are traditional for a reason.
Edited, Aug 5th 2011 2:07am by RizzoRazzle
~SMN99 BRD99 BLM99 BLU99 WHM99 DNC99 THF99 RDM95 COR95 SCH95 RNG75