Music can't be judged wheter is of high or low quality. it is a personal choice and completely subjective
Is of = has
of از، ازبرای، اززمره، در زمره، از گروه، از طبقه، از دسته
یک فعل مرکب است به معنی have
This cake is of the highest quality
این کیک بالاترین کیفیت را دارد
Iranian products are of very high quality
محصولات ایرانی کیفیت بسیار بالایی دارند
a man of discretion = a man who ‘possesses’ discretion, “a discreet man”.
This approach is of value. = This approach ‘possesses’ value, “it is valuable”
ترکیب to be of… یعنی ( ( داشتنِ . . . ) ) . مثلا وقت می گوییم ( ( It is of importance ) ) یعنی ( ( اهمیت دارد ) ) .
دارای