Together We Can Improvise comes with a CD of tracks for the teacher and students to use with the exercises. Some of the tracks are vaguely reminiscent of Rhiannon's Flight: Rhiannon's Interactive Guide to Vocal Improvisation. Taking Flight/Soaring, which I have used many times with my adult students. They are generally high quality, though I feel some of the singers should have warmed up better prior to recording. Their resonance becomes thin at times, which is important given that children are actively collecting auditory voice models in this period of their lives.
I recommend Together We Can Improvise to classroom teachers or private studio teachers who want to help young students learn to improvise with confidence.