I'm just going to drop an idea for a rework I posted on another tread a while back, obviously it's not going to be perfect since I have no way to test it but I strongly believe it would be better than what we have now.
Passive: Powerchord
Sona plays her basic spells as a three spell Powerchord, after casting her first and second spell she puts her basic spells on a 0.5 second global cooldown and after casting her third spell Sona puts all of her basic spells on a longer cooldown, additionally if Sona doesn't cast a spell for 2 seconds during a powerchord all of her spells go on this same longer cooldown. Only the first spell Sona plays costs mana and her basic spells mana cost scales with her level. Additional spells hitting the same target within a single Powercord have only 50% of their normal effect. Sona will gain the effect of all the spells played in her song for her powerchord on hit, IE she can gain a Qx1/Wx1/Ex1 effect.
After completing a Powerchord Sona's next basic attack becomes empowered gaining additional magic damage and bonus effects based on what spells she played during her Powerchord.
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Qx1: Powerchord deals 25% bonus damage
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Qx2: Powerchord's damage and effect are applied in a 200 unit raduis AoE around the target struck
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Qx3: Powerchord deals an additional 40% bonus damage, additive with the 25% from Q1 for a total 65% bonus
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Wx1: Powerchord reduces target damage output by 25% for 2 seconds
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Wx2: Powerchord reduces target damage output by an additional 25% for a total of 50% and lasts for 3 seconds
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Wx3: Powerchord reduces target damage output by an additional 25% for a total of 75% and silences the target for the first 1.5 seconds
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Ex1: Powerchord slows the target by 40% for 2 seconds
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Ex2: Powerchord slows the target by an additional 20% for a total of 60% and additionally grounds the target for the duration
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Ex3: Powerchord roots for 1 second after it hits and the slow is extended by 0.5 seconds, lasting 1.5 seconds after the root ends
Magic Damage: 10/lv+(25% AP)
Powerchord CD: 14/11/8/5 at 1/6/11/16 (affected by CDR)
Manacost: 80/100/120/140 at 1/6/11/16
Q: Sona fires a line missile with a small AoE on target hit which deals magic damage and debuffs enemies hit. Enemies attacked by Sona or her allies with a debuff on them take bonus magic damage and consume the debuff.
Damage: 30/80/130/180/230+(60% AP)
Debuff damage: 4/13/22/31/40+(20% AP)
Range: 900 (slightly shorter than Karma Q)
Radius: 200
Debuff duration: 2 seconds
W: Sona heals herself and a target ally, after 1 second if Sona is still within the cast range and both her and her ally are alive both gain a shield equal to the heal. This shield can stack when a target is healed multiple times. If Sona does not have an ally nearby she can self cast the heal and always gains a shield for half the listed value after 1 second.
Heal/Shield Value: 15/40/65/90/115+(30% AP)
Shield Duration: 2 seconds
Range: 600 units
E: Sona grants herself and a target ally flat bonus MS for 3 seconds, repeat casts on the same target extend this duration by 1.5 seconds but do not increase the MS amount, Sona will always receive a 1.5 second extension for casts past the first. Additionally targets under this effect gain slow resistance.
Flat MS: 28/36/44/52/60+(0.1 AP)
Slow Resist: 15/20/25/30/35%
Range: 600 units
Duration: 3 seconds
R: Same as live sans the CD reduction on her basic spells since this is now incorporated into the way her passive works.