Final answer:
Johann likely has high self-efficacy, as he has a strong belief in his musical abilities, supported by success and positive feedback from teachers.
Step-by-step explanation:
Johann's ability to easily learn music pieces and musical instruments, along with the positive feedback from his music teachers, suggests that he is more likely to have good self-efficacy. Self-efficacy is defined as an individual's belief in their own capability to complete a task. This concept includes the ability to master challenges and quickly recover from setbacks. In Johann's case, his confidence in musical abilities is bolstered by his teachers' reassurance and his own experiences of success.