The author discusses the notation of action-based music, in which physical gestures and their characteristics, such as shape, direction and speed (as opposed to psychoacoustic properties such as pitch, timbre and rhythm), play the dominant role in preserving and transferring information. Grounded in ecological perception and enactive cognition, the article shows how such an approach mediates a direct relationship between composition and performance, details some action-based music notation principles and offers practical examples.

This article explores the role of symbolic score data in the authors' mobile music-making applications, as well as the social sharing and community-based content creation workflows currently in use on their on-line musical network. Web-based notation systems are discussed alongside in-app visual scoring methodologies for the display of pitch, timing and duration data for instrumental and vocal performance. User-generated content and community-driven ecosystems are considered alongside the role of cloud-based services for audio rendering and streaming of performance data.

Written and drawn annotations of musical scores form a core part of the music composition process for both individuals and groups. This article reflects on the annotations made in new forms of distributed music-making wherein the score and its annotations are shared across the web. Four kinds of annotation are identified from 8 years of studies of mutual engagement through distributed music-making systems. It is suggested that new forms of web-based music-making might benefit from shared and persistent graphical annotation mechanisms.

There have been numerous artists, architects and designers whose encounters with traditional Japanese garden aesthetics have produced creative works. The author examines John Cage's Ryoanji, a musical translation of the famous karesansui garden in Kyoto, as an important musical precedent and uses it to position his own methodologies for transmediating the spatial predilections of the Japanese garden Sesshutei.

Increased maturity in modeling human musicianship leads to many interesting artistic achievements and challenges. This article takes the opportunity to reflect on future situations in which virtual musicians are traded like baseball cards, associated content-creator and autonomous musical agent rights, and the musical and moral conundrums that may result. Although many scenarios presented here may seem far-fetched with respect to the current level of artificial intelligence, it remains prudent and artistically stimulating to consider them.

The advent of on-line communities has democratized the process of musical interface design and allowed users to directly participate in the future development of the devices they use. On-line communities, acting as centralized repositories for information pertaining to the development of an interface, allow users to discuss their experiences and ideas as well as providing a framework for managing information pertaining to an interface. This centralized access to information regarding the design, use and development of an interface both focuses and accelerates the developmental process.

The author describes the practical application of crowdsourcing human intelligence as a form of collaborative music-making. Spectral decomposition of an original recording is used to derive components from original audio, and these are then offered as on-line tasks in which contributors are asked to record their own interpretations of each component. Components are then gathered in order to re-synthesize the original corpus, which is used to build an improvisation system.

The author discusses live coding as a new path in the evolution of the musical score. Live-coding practice accentuates the score, and whilst it is the perfect vehicle for the performance of algorithmic music it also transforms the compositional process itself into a live event. As a continuation of 20th-century artistic developments of the musical score, live-coding systems often embrace graphical elements and language syntaxes foreign to standard programming languages.