Li Shenron
Legend
Which gets really wonky if she is using her arms to make somatic components to cast a spell and her voice to play a kazoo as a focus to replace material components to cast a spell and her voice to speak the verbal components to cast a spell and her voice to inspire her comrades with oratory and her voice to speak insults (Cutting Words) to prevent the enemy magician from successfully Counterspelling her spell.
It's wonky only when you pretend to define the details.
You could instead say that the Bard is speaking the same word(s) to achieve all the effects together, and is capable of doing so only because of ability that works as a bonus action.