Sona relaunch concept

The current iteration of Sona's kit isn't in DESPERATE need of an update, but it kinda feels like half of the champs on the rift are deaf when she plays her music. She should affect everyone near her and I feel her "songs" are currently more like single measures. That being said, this is more thematic and less to fill a gameplay need. Numbers are all variable, I'm no expert in balance. All activation effect match the range of the aura at 20 sec after activation.

Passive: Crescendo: The aura on sona's abilities gains increased range and power the longer it remains active, capping at 1 minute. (upon activation should cover an area the sise of red buff's pit)(after 1 minute should cover an area approximately equal to the range of a turret)

Q: Toggle: upon activation deals damage to all nearby enemy champions(scaling w/ AP). While active increases the damage dealt by allied champions within by 5%/7%/10%/12%/15% up to 20%/30%/40%/50%/60%(prior to mitigation) Cost: 15/18/21/23/25 mana per second

W: Toggle: upon activation shields all nearby allied champions(scaling w/ AP). While active decreases damage dealt by enemies within the aura by 3%/6%/9%/12%/15% up to 30%/35%/40%/45%/50%(prior to mitigation) Cost: 20/22/25/27/30 mana per second

E: Toggle: upon activation slows all nearby enemy champions(scaling w/ AP). While active increases movement speed of all allies withing the aura by 10%/12%/15%/17%/20% up to 50%/55%/60%/65%/70% Cost: 15/18/21/24/27 mana per second

R: Active: Reduces the mana cost of all basic abilities by 50%/70%/90% for 30 seconds Cooldown: 200 seconds Cost: 100 mana Usage: used to allow multiple auras to be used without draining mana too quickly and to be built up throughout a fight

Names w/ the exception of the ult would remain the same. I don't know what to call the ult, if you have suggestions I'd be glad to hear them.