The Lost Chord

This is an Apple Books audiobook narrated by a digital voice based on a human narrator.

As a poisonous wave spreads disease and discord across the eleven known universes, the Conductor races to find the seven Keys and strike the Lost Chord. He searches among the universes for persons whose souls vibrate at a particular musical frequency. One such Key is Bee Warrick, an autistic teenager from Earth who has traveled between the realms for years without realizing it. Can Bee help the Conductor find the other Keys before a bitter enemy strikes the wrong chord and shatters the universes? [Young Adult Fantasy]