What I think they need to do for Bard
I've seen mostly bad Bard's but I've also seen good ones, I think he has potential but I also think he's going to need some small buffs to make him more robust.
Increase his AA range by 50, increase his base AD by 5 (Seriously, he has the same base AD as f$c&i@g Karthus and Karthus even outscales him).
Change the ally movement speed bonus on his E to a flat 30% and move that potential power somewhere else. His E is the last thing he maxes anyway and it's far too situational for some of his power budget to be in that.
Increase the ratio on his Q, It's his only damaging ability and his passive is too unreliable and quick to burn through to trully be a second balancing lever, it doesn't have to be like Zilean, but maybe improve it to .7 AP. Also, either increase the missile width of his Q or increase its speed (Seriously, it's Anivia Q levels of slow)
Finally, reduce the required number of chimes to reach the maximum number of unique passives for his... passive. Someone did the math and even if you collected all of his chimes as soon as they spawn, you'll never collect enough to max your passive in even a 40 minute game.
These are just my suggestions for some small buffs, agree or disagree but please leave a comment explaining your reasoning.