This study examined computer-mediated communication (CMC) -- blogs and responses to YouTube postings -- to better understand how CMCs reflect adolescents' attitudes towards musicians playing instruments that cross gender stereotypes. Employing purposive sampling, we used specific search terms, such as "girl drummer", to identify a sample of 32 English-language blogs addressing boys' and girls' instrument choices. The texts of these blogs were analysed and coded according to emergent themes. Online participants used CMCs to provide mutual support, seek out role models, highlight the relationship between physical appearance and playing a specific instrument, comment on the performance of musicians of the opposite sex, examine the relationship between music genre and musicians' gender, and debate sexual orientation issues related to instrument choice. Our results show that the web can be a supportive place for these instrumentalists as well as a place that replicates the harassment they may experience in person.