The topic of this master thesis is the introduction of new technological trends in the post- transition countries' markets, where particular emphasis is placed on the case of music streaming services in Croatia. The thesis consists of a theoretical part prepared with the help of literature from domestic and foreign authors and secondary research results. The theoretical part includes the presentation of post-transition countries where the dynamics of transformation depends on the current stage of development of each of these countries, as well as the difficulties encountered in adopting new trends. The following describes the habits of listening to music in the past as well as the arrival of music streaming services. Generations are presented along with their attitudes and habits, and millennials are especially important here as they are the dominant consumer group globally when it comes to music streaming services. Although Croatia has lagged behind this trend for years, the situation has changed significantly with the expansion of music streaming services through 2020 and 2021, and the aim of this thesis is to examine current listening habits of millennials in Croatia and their interaction and satisfaction with music streaming services as well as their preferences. Through a survey conducted for the purpose of writing this thesis, we gain insight into how millennials are familiar with the latest technological trends, including music streaming applications, and the survey questions are a way to examine their attitude and intention to use. Fogg's behavioral model as well as the model of creating experimental situations that were used as control questions for hypotheses helped in forming this survey. After the results of secondary and primary research, the conclusion of this thesis was written, which describes the current situation and attitudes, after which certain proposals were presented that could help in forming a marketing strategy for music streaming services in Croatia.