the thing is sona is very easy to play, but kinda bitch to master. the trick is knowing what kind of power cord to use. most of the time i see people just use her q and power cord, which is fine for damage and harass, but if your about to be engaged is best to use the w as it reduces the damage the enemy does, or if your chasing the e slows them. plus her ult is great for preventing and countering tower dives.
and oh dam if you play he ap she can hit like a truck! this is a game i played as support, we where snowballing bot lane so i thought **** it and garbed a Mejia's. 15 stacks by end game, i almost one hit the enemy with my q power cord.