Generative Music with Stochastic Diffusion Search -- Music with Unconventional Computing: Towards a Step Sequencer from Plasmodium of Physarum Polycephalum -- Feature Discovery by Deep Learning for Aesthetic Analysis of Evolved Abstract Images -- FuXi: A Fish-Driven Instrument for Real-Time Music Performance -- Chorale Music Splicing System: An Algorithmic Music Composer Inspired by Molecular Splicing -- Towards an Evolutionary Computational Approach to Articulatory Vocal Synthesis with PRAAT -- The Sound Digestive System: A Strategy for Music and Sound Composition -- Avoidance Drawings Evolved Using Virtual Drawing Robots -- A Genetic Programming Approach to Generating Musical Compositions -- AudioInSpace: Exploring the Creative Fusion of Generative Audio, Visuals and Gameplay -- Toward Certain Sonic Properties of an Audio Feedback System by Evolutionary Control of Second-Order Structures -- Echo -- Evotype: Evolutionary Type Design -- Interior Illumination Design Using Genetic Programming -- Lichtsuchende: Exploring the Emergence of a Cybernetic Society -- Automatic Generation of Chord Progressions with an Artificial Immune System -- Evolving Diverse Design Populations Using Fitness Sharing and Random Forest Based Fitness Approximation -- Moody Music Generator: Characterising Control Parameters Using Crowdsourcing -- Schemographe: Application for a New Representation Technique and Methodology of Analysis in Tonal Harmony -- Biological Content Generation: Evolving Game Terrains Through Living Organisms -- Interpretability of Music Classification as a Criterion for Evolutionary Multi-objective Feature Selection -- On the Stylistic Evolution of a Society of Virtual Melody Composers -- DrawCompileEvolve: Sparking Interactive Evolutionary Art with Human Creations.

This book constitutes the refereed proceedings of the 4th International Conference on Biologically Inspired Music, Sound, Art and Design, EvoMUSART 2015, held in Copenhagen, Denmark, in April 2015, co-located with the Evo* 2015 events EuroGP, EvoCOP and Evo Applications. The 23 revised full papers presented were carefully reviewed and selected from 43 submissions. They cover a wide range of topics and application areas, including generative approaches to music, graphics, game content and narrative; music information retrieval; computational aesthetics; the mechanics of interactive evolutionary computation and the art theory of evolutionary computation.