There were many adult pipa classes to choose from in Beijing. The following are some possible places: 1. Pipa Training Class of Beijing Dance Academy: This class is taught by the music and dance professor of Beijing Dance Academy. It is suitable for beginners and experienced pipa lovers. Training classes were usually held on weekends or in the evening. 2 Beijing City Pipa Training Class of the Beijing Cultural Palace: This class is taught by the music and dance coach of the Beijing City Cultural Palace. It is suitable for beginners and experienced pipa enthusiasts. Training classes were usually held on weekends or in the evening. 3. Pipa Training Course at Beihang University: This training course is taught by a professor from the Music and Dance Department of Beihang University. It is suitable for beginners and experienced pipa lovers. Training classes were usually held on weekends or in the evening. 4 Peking University Pipa Training Class: This class is taught by a professor from the Department of Music and Dance of Peking University. It is suitable for beginners and experienced pipa enthusiasts. Training classes were usually held on weekends or in the evening. Please note that the above information is for reference only. The specific training time and course schedule may vary according to the time and place. It is recommended to call or go to the local music education institution for more information before choosing a training course.