It's time to play!
Buy it when playing with Sivir.
Not Updated For Current Season
-AoE cc after 6,
-AoE heal and shield,
-faster than Usain Bolt,
-dmg, dmg reduction or slow in just one passive!
Playing as Sona you can pick preety much everything:
http://www.mobafire.com/images/summoner-spell/flash.png is obvious choose. Crazy mobility with your E and great initiation after 6,
http://www.mobafire.com/images/summoner-spell/ghost.png if you need gotta go fast,
http://www.mobafire.com/images/summoner-spell/ignite.png for offensive plays,
http://www.mobafire.com/images/summoner-spell/exhaust.png if you need to reduce enemy nuke,
http://www.mobafire.com/images/summoner-spell/teleport.png if your top took offensive plays,
http://www.mobafire.com/images/summoner-spell/barrier.png if you want to roleplay tank.
When you start a game, use your q on resp once if you are going to help jungler or twice. In laning phase try to poke enemy adc with http://www.mobafire.com/images/ability/sona-hymn-of-valor.png and http://www.mobafire.com/images/ability/sona-power-chord.png . This combo uses all 3 stacks of http://www.mobafire.com/images/item/spellthiefs-edge.gif .
Later just guard your adc until you get your first offensive item. My first favourite is Lich Bane. Then you can try to kill enemies solo.