In this paper we propose aesthetic heuristics as an area of study within ubiquitous music research. Initially we discuss the motivations for narrowing the focus of the experimental variables involved in creativity-centred design studies. Then we place aesthetic heuristics within the current efforts toward designs for creativity support, highlighting recent studies that target everyday musical creativity. The reviewed experimental results point to a gap between the current theoretical proposals in musical creativity and the factors that impact everyday musical activities. Self-referentiality of the experimental-theoretical construct and early domain restriction are two of the limitations pointed out by previous theoretical work. We provide a working definition of aesthetic heuristics, indicating its object of study and its rationale. We also lay out initial experimental strategies. Potential contributions from interaction aesthetics and ubimus research are discussed, introducing the concept of creative bias and a set of experimental hypotheses. The last section of the paper furnishes examples of creative biases within the context of musical interaction design.