The Music Information Retrieval (MIR) community has long understood the role of evaluation as a critical component for successful information retrieval systems. Over the past several years, it has also become evident that user--centered evaluation based on realistic tasks is essential for creating systems that are commercially marketable. Although user--oriented research has been increasing, the MIR field is still lacking in holistic, user--centered approaches to evaluating music services beyond measuring the performance of search or classification algorithms. In light of this need, we conducted a user study exploring how users evaluate their overall experience with existing popular commercial music services, asking about their interactions with the system as well as situational and personal characteristics. In this paper, we present a qualitative heuristic evaluation of commercial music services based on Jakob Nielsen's 10 usability heuristics for user interface design, and also discuss 8 additional criteria that may be used for the holistic evaluation of user experience in MIR systems. Finally, we recommend areas of future user research raised by trends and patterns that surfaced from this user study.
Choreography uses patterns of movement to portray moods and emotions.It therefore provides the designers of virtual environments with an opportunity to overcome some significant limitations of current virtual worlds, which are perceived as places lacking atmosphere and feeling. The paper reports the results of an experiment, which established that choreographic techniques can be used for the portrayal of specific moods by groups of automated agents in 3D virtual worlds.
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