Rothenberg is a New Age writer and musician that enjoys playing music to birds and jamming their singing with the sound from different wind instruments. Surey lots of fun. However, it is from this perspective that he attemps to understand why birds sing. To be true, he does review some scientific papers and provides a not too bad coverage of the findings of the scientific literature. But Rothenberg enjoys exposing the shortcomings of this research (rather pretentiously by the way) and coming up with unscientific ideas of his own based on his feelings about why birds should spend so much time singing. He seriously believes that his empathic method of blowing desceding fifths and chromatic scales with his clarinet to singing birds can take him a long way into understanding the misteries of bird song. Good luck to him.