You mention "managing" emotions in the new cantrip, which tips it into the Empathy keyword, and not the hypnotic nature that can be applied to Sound/Song, which can work to compel, lure, distract, or similar. This needs to be rephrased to clarify your meaning and bring it in concordance with the Sound/Song keyword.
As an additional note, the original Lullaby cantrip was something we thought was perfectly acceptable, with the caveat that a player character would not be guaranteed to fall asleep unless you rolled for it. It could however make them sleepy or put NPCs to sleep. It would also not work on Encounters, unless paired with a relevant Magic Keyword Cinder roll (Sound/Song, in this case) that exceeds its DC, so you could combine it with an attack roll to good effect.
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