ObjectiveKaraoke is a well-established leisure activity among Japanese high school students, with some attending almost daily or enjoying it alone in what is commonly referred to as “one-person karaoke.” During adolescence, many students develop strong attachments to particular artists or songs. In a survey of ten 16-17-year-olds, all respondents (100%) reported having a favorite song, suggesting that students frequently choose their “oshi-kyoku” (favorite song) in karaoke. This study aimed to examine how singing favorite versus non-favorite songs influences brainwave activity, focusing on alpha and beta rhythms.MethodsParticipants were five high school students in Saitama Prefecture, Japan. Each identified one favorite song, which was paired with another participant’s favorite song as their non-favorite. The design ensured that each non-favorite was another’s favorite. A crossover design was adopted: two participants sang their favorite first, while three sang in the reverse order. Each session lasted 10 minutes, with a 30-second rest after each song. Portable EEG and ECG devices recorded brain activity, and analysis focused on alpha (8-13 Hz) and beta (20-25 Hz) waves in time series.DiscussionSinging favorite songs is expected to engage personal attachment and positive affect, with EEG indices showing increased alpha power (relaxation and comfort) alongside temporary rises in beta activity (concentration and arousal). This suggests a state of “dominant alpha with moderate beta,” reflecting immersion and well-being. Conversely, singing non-favorite songs tends to reduce alpha activity while elevating beta, indicating effortful engagement.ConclusionThese findings suggest that karaoke is not only a popular pastime but may also serve as a meaningful educational and psychosocial tool. Singing favorite songs could foster adolescent well-being, relaxation, and self-expression, highlighting the importance of incorporating students’ musical preferences into school and community music education.