Interesting research on music as a calming effect? https://www.sciencedirect.com/science/article/abs/pii/S0031938416306977
Our Basenji Paladin could not be left alone, we tried everything, one thing sort of worked rescue remedy and touch tell massage. We had many pet sitters. Our new Basenji is so carefree and problem free it's a miracle. Miles is Basenji # 5 so maybe we just learned from all the others....
Also, a list of reads and research including the use of Bach Flower Remedies,
Articles on Don’s Blog
Alone Training – http://www.greenacreskennel.com/blog/2014/08/01/dog-training-alone-training/
Preventing separation anxiety – Teaching your dog to cope with being alone – http://www.greenacreskennel.com/blog/2016/03/14/dog-training-preventing-separation-anxiety-teaching-your-dog-to-cope-with-being-alone/
ADAPTIL/DAP COMFORTZONE – http://www.greenacreskennel.com/blog/2014/08/14/canine-behavior-adaptild-a-p-comfortzone/
Understanding, Identifying and Coping with Canine Stress – http://www.greenacreskennel.com/blog/2015/11/01/canine-behavior-understanding-identifying-and-coping-with-canine-stress/
Pet Behavior and Wellness – Pet Behavior as an Essential Component to Holistic Wellness – http://www.greenacreskennel.com/blog/2016/10/28/pet-behavior-and-wellness-pet-behavior-as-an-essential-component-to-holistic-wellness/
Your Pet’s Behavioral Health Is As Important As Their Physical Well-Being: The New AAHA Canine and Feline Behavior Management Guidelines – http://www.greenacreskennel.com/blog/2015/08/01/pet-health-and-wellness-your-pets-behavioral-health-is-as-important-as-their-physical-well-being/
Introduction to Canine Communication – http://www.greenacreskennel.com/blog/2015/04/05/dog-training-introduction-to-canine-communication/
An Overview of the Bach Flower Remedies – http://www.greenacreskennel.com/blog/2015/06/22/bach-flower-remedies-an-overview-of-the-bach-flower-remedies/
Good Luck, you will get through this!