Music frequently accompanies seniors’ physical activities—from morning stretches and rhythmic dance to yoga and interactive electronic mat games—creating an atmosphere that seems to enhance motivation and enjoyment. Yet it remains uncertain whether these positive feelings stem directly from music itself or from the social connection and emotional engagement inherent in group activities. Previous research has suggested that rhythmic, attention-capturing music can improve exercise performance and enjoyment (Karageorghis & Priest, 2012; Terry et al., 2020). However, most of these studies were conducted under controlled laboratory conditions to ensure consistency in tempo, volume, and task structure, presuming that participants consciously synchronized their movements with the rhythm. In real-world community settings, the role of music varies by activity: it may guide movement and breathing in rhythmic dance or yoga but function only as a soundscape or auditory cue in visually guided, competitive exercises such as interactive electronic mat games.The present study examines whether seniors’ belief in music’s motivational role relates to their sense of well-being when music functions merely as background sound. Participants aged 65 and above who engage in regular exercise are being recruited from senior community groups in Taipei and New Taipei City. After completing an interactive electronic mat exercise session, participants rate their well-being across four dimensions—physical, psychological, social, and eudaimonic—through a structured questionnaire. Three groups are compared based on their belief levels regarding music’s motivational effect (A: strongly agree; B: agree; C: neutral) using descriptive statistics and One-way ANOVA to identify between-group differences.Preliminary analyses show medium-to-high well-being scores across all groups, suggesting that interactive physical activity itself enhances positive affect and social interaction. Minimal differences among groups indicate that the psychological influence of music in this setting may depend on two conditions: whether music is consciously attended to and whether it aligns with the activity’s rhythm and context. As ongoing data collection expands, further analysis will test these conditions and clarify how background music, perception, and contextual congruence contribute to well-being formation among seniors. The study provides an evidence-based perspective on how music’s role in exercise is not automatically effective but contingent upon perception and contextual fit, offering implications for community-based active aging programs.