Well, with the option to mute 'Perform Spells' (which is what I would call it in the Options). I would welcome being able to macro it to abilities.
...I mean, just imagine drumming out Highway to Hell during the final phase of a boss for a BRD attack 'song'. Or Thundercats (theme song) when buffing.
Basically, actually making Bards a real Bard; using music to bolster their allies, and weaken their foes!
((Note: From the Bards that I've run with I don't hear any kind of music while their buffs are on me....they [the buffs] just kind of show up and that's it. There's no "Bard feel" to it. At least with this the player could choose to RP as a true bard.))