I've seen a lot of Bard players going out of lane, leaving their ADR for some time to collect chimes and that makes me think if they (chimes) are really important for Bard, as well as souls for Thresh.
Yes, it upgrades the damage of the meeps, grants EXP and MS and recovers mana too.
But the thing is that the chimes are USUALLY placed far from the lane.
It is risky to wander when the bot lane of the enemy can kill your carry in a jiffy (e.g. Leona, Blitz, Thresh) as well as the fact that the enemy jungler/mid might just run into you. (1 chime = 1 death, really worth)
TL;DR : Is there really an advantage in collecting these 'chimes' than staying in lane? If so, how do I use it (for the MS, EXP and mana) efficiently?