Stephan Resch had a workshop for DJs in Pasion Por Tango and at the NZ Tango Festival and introduced this interesting book. The author has his own website www.tangomusicsecrets.co.uk.
The book and website provide great insights into tango orquestas.
Tango Stories – Musical Secrets is available for purchase online at www.amazon.com/Tango-Stories-Musical-Michael-Lavocah/dp/0957327617