Calliope's Ethereal Notes

When playing a song the notes seem to shoot off the instrument like arrows at a target of your choice.As an action you can shoot ethereal notes out of your instrument like arrows from a bow. Make a ranged spell attack against a target on a hit deal 4 (1d8) thunder.

The spell's damage and projectiles increase when you reach 5th level (2d8 & 2 targets), 11th level (3d8 & 3 targets), 17th level (4d8 & 4 targets).