Repeat play the last music

Unity
2

There is currently no way to set the event on a Studio Event Emitter using script, there is some discussion on it here.
You can try adding a method to the FMOD Studio Event Emitter that sets a new event:

// Assets/Plugins/FMOD/src/StudioEventEmitter.cs
public void ChangeEvent(string newEvent)
{
    EventReference = EventReference.Find(newEvent);
    EventInstance.stop(FMOD.Studio.STOP_MODE.IMMEDIATE);
    Lookup();
}

// test.cs
public void Play()
{
    s.ChangeEvent("event:/Music/Level 01");
    s.Play();
}

public void Stop()
{
    s.ChangeEvent("event:/Music/Level 02");
    s.Play();
}

The recommended approach is to create your own script. You can can take a look at how to call the FMOD Studio API yourself in the Unity Basic Scripting Example.