The book "Tango Course" by Horace Salgán is the first written from a technical-musical perspective that exposes all his knowledge in the construction of the Tango and reveals his working methods of his 83 year career. It do not inquire into the nature of the Tango or follow a historical study of their evolution. It is a study of the Tango; details piano, orchestral, rhythmic and harmonic. It is intended for musicians and teaching is provided with examples in small scores that can be heard on the CD that comes with the book.