PİYANO EĞİTİMİNDE GRUP DERSLERİNİN BİREYSEL DERSLERE GÖRE AVANTAJLARI VE DEZAVANTAJLARI (ADVANTAGES AND DISADVANTAGES OF GROUP LESSONS COMPARED TO INDIVIDUAL LESSONS IN PIANO EDUCATION) - Buket YILMAZ -Verda KARAÇİL CERİT | The Journal of Academic Social Science