  We present the results of a 12-week longitudinal user study wherein the
participants, 110 subjects from Southern Europe, received on a daily basis
Electronic Music (EM) diversified recommendations. By analyzing their explicit
and implicit feedback, we show that exposure to specific levels of music
recommendation diversity may be responsible for long-term impacts on listeners'
attitudes. In particular, we highlight the function of diversity in increasing
the openness in listening to EM, a music genre not particularly known or liked
by the participants previous to their participation in the study. Moreover, we
demonstrate that recommendations may help listeners in removing positive and
negative attachments towards EM, deconstructing pre-existing implicit
associations but also stereotypes associated with this music. In addition, our
results show the significant clout that recommendation diversity has in
generating curiosity in listeners.
