a neat little trick to using bard's ult.
sometimes ulting the enemy team is necessary as if can give your high cc teamcomp a chance to ready groupwide facestomping cc. but there are other, much more likely circumstances in which you will have a decision to use your ult.
if you feel you can't hit more than 2 people with bard's ult, shift the focus from the mobile targets, and the immobile targets. instead of aiming for a harder to land delayed skillshot on a group of moving enemy's, try ulting just their turret. that alone is enough to make a team falter just long enough for you to pounce and get the advantage if a champion is standing far enough away from his minion wave at your turret, don't ult him and your turret! instead ult all of the minions behind him and FORCE that tower to hit him until he either leaves or you can get him so low its easy pickings once you get there.