Study Music Alpha Waves: Relaxing Studying Music, Brain Power, Focus Concentration Music, ☯161
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234872https://www.youtube.com/watch?v=HL9GQtVKkUY편안한 휴식, 스트레스 해소, 명상 등 힐링 음악 Music for Relaxation, Stress Relief, Meditation, Concentration and Study 1