Sona, Maven of Strings

Every third instant or sorcery spell
1 note counter is attached to Sona, Maven of Strings.
For each note counter you may {t} add 1 Mana
of any color
Crescendo - {6}{u}{g} Tap all creatures on an opponents battlefield. They may untap at the beginning of you opponents next turn. Remove all note counters. Use only as a sorcery.