The structure of music preferences has been investigated extensively. However, development of music preferences in terms of consistency of music taste is as yet understudied. In this study, intra-individual consistency of music taste was assessed among Dutch adolescents and young adults over three points in time in a 21-month period. An internet-based panel of 236 participants was asked to list their top three favourite artists or bands, and to rate their preferences for a range of music genres. Genre ratings were grouped into five styles: pop, urban, elite, rock and dance, using factor analysis. Thus there were three measures of music taste for each participant over time: favourite artists, preference for musical genres and styles. Findings indicated that favourite artists tended to have a high turnover rate, that genres were rated relatively consistently with moderate to high q-correlations (between 0.41 and 0.67), and that style preferences were highly consistent (q-correlations between 0.77 and 0.86). Differences in consistency over time across gender and educational level were not substantive, but age was positively related to music taste consistency. It is concluded that music taste is already well developed in early adolescence, and crystallizes further during late adolescence and early adulthood. (Contains 5 tables.)