The term "classical music" did not appear until the early 19th century, in an attempt to distinctly canonize the period from Johann Sebastian Bach to Beethoven as a golden age. The earliest reference to "classical music" recorded by the Oxford English Dictionary is from about 1836.
কোন বইয়ে 'শাস্ত্রীয় সংগীতের' প্রাচীনতম উল্লেখ রয়েছে?
Oxford English Dictionary