8 As Richard Feynman coined it: "What I cannot create, I do not understand." 9 Initially codified in 1950 by Alan Turing and named by him the "imitation game" [191], the "Turing test" is a test of the ability for a machine to exhibit intelligent behavior equivalent to (and more precisely, indistinguishable from) the behavior of a human. In his imaginary experimental setting, Turing proposed the test to be a natural language conversation between a human (the evaluator) and a hidden actor (another human or a machine). If the evaluator cannot reliably tell the machine from the human, the machine is said to have passed the test. 10 This is to avoid the bias (synthetic flavor) of a computer rendered generated music. 11 Improvisation is a form of real time composition. 12 With some precaution, as this division is not that strict. 13 The general objective of integrating sub-symbolic and symbolic levels into a complete AI system is among the "Holy Grails" of AI. Chapter 2 Method In our analysis, we consider five main dimensions to characterize different ways of applying deep learning techniques to generate musical content. This typology is aimed at helping the analysis of the various perspectives (and elements) leading to the design of different deep learning-based music generation systems 1. 2.1 Dimensions The five dimensions that we consider are as follows. 2.1.1 Objective The objective 2 consists in: • The musical nature of the content to be generated. Examples are a melody, a polyphony or an accompaniment; and • The destination and use of the content generated. Examples are a musical score to be performed by some human musician(s) or an audio file to be played. 2.1.2 Representation The representation is the nature and format of the information (data) used to train and to generate musical content. Examples are signal, transformed signal (e.g., a spectrum, via a Fourier transform), piano roll, MIDI or text. 2.1.3 Architecture The architecture is the nature of the assemblage of processing units (the artificial neurons) and their connexions.