Hi fellow Bard player i'm S4lci, a random Italian Bard player that is trying to create his own build. My english still lacks and I don't have nearly the experience of a pro player so I still suggest to check their builds on this site (Lasthyrus a.e.). Anyway I hope you enjoy and win games with this build, by the way lets move on to the actual game explain.

Bard's early game can be very good depending on your opponent, you need to poke them as much as possible in the first level with your Q and gaining gold with your starting item in this small ammount of time get your first 3/4 chimes (the first two spawns within the first minute and are the easiest to get, the third one spawns near you at 1.15 so check your position around that time so the bell isn't in the other jungle).
At level 2 you start placing your W to heal your teammates,remember that their heal increases with time so place them in a safe position and just wait your ADC to get them. With this move you can get the opponent to think that your mate is in trouble, double-stun them and win the lane; good job.
At level 3 you will start to roam, place your wards and get your chimes that will scale your damage and restore your mana, don't get too far from the lane and return as much as possible to help your ADC. Get your boots and your ability haste in the shop and go back to the lane.
By level 6 you can start making plays with your R and let your ADC get the double kill ( if your lucky) if you mess up you will lose the lane so be very careful. Now you probably have your boots so it's time to head into mid game.

By level 8 or 9 you would have win or lost your lane and probably got your mythic item, now it's time to roam and help the other two lanes while getting chimes and doing assist. Keep your head down and use your prtal and R to get crucial kills and remeber to purchase wards and control the objectives.
With your deadman's plate you will be able to fly from one side to the other of the map at the speed of light and get extra kill participation.

After cosmic drive you will be very important for the team fights, never go around the map alone and check the lanes, depending on your situation get your last item and now focus on Baron, Elder and the dragon soul. With your R you can turn teaamgifhts upside down (on both sides ;9), stop objectives and save your tower while your teammates are dead.
GG and have fun with Bard.