Compelled duet

As the verbal components of this spell you loudly start singing a song. A creature of your choice within range that can hear you must succeed on a Charisma saving throw. If the target knows and likes the song you sing, it has disadvantage on its saving throw. On a failed save it magically knows the melody and lyrics of your song and must sing loudly along to your song if it is able to. While the spell lasts neither you or the target are able to cast spells with verbal components. 

Once each minute, and each time it takes damage, the target can repeat its Charisma saving throw. The target has advantage on the saving throw if it's triggered by damage. On a success, the spell ends. The spell has no effect on creatures immune to being charmed.