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Buy it when playing with Sivir.
Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
-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.