Albahn's Forced Singalong

Target up to 5 creatures within range. Each Creature must make a Charisma Saving throw or be forced to sing along on a failed save. Creatures effected have disadvantage on attacks and can't use spells or spell like abilities that require verb components. At the beginning of the affected creature's turn or when they take damage, the creature can make a charisma saving throw. 

Creatures immune to charm effects or can't speak a language are immune to this spell.

Casting at higher levels allows the caster to target 2 extra creatures within range for each spell level above 3rd level.