Did Michael Masse (Jordie Black) actually sing the vocals to We Are One Child himself on episode Reunion Law and Order or was it dubbed by someone else?

While Jordie Black (Michael Masse) was credited as the singer for the song "We Are One Child" in the Law & Order episode "Reunion," it was actually not his voice.

The vocals were sung by Michael's real-life father, Michael Masse Sr.

It's a great example of how television often uses creative solutions to get the right sound for a scene.