indiscernibility of identicals

listen to the pronunciation of indiscernibility of identicals
الإنجليزية - الإنجليزية
The principle that if two objects are absolutely identical then they must be indistinguishable from one another with respect to all of their properties

For example, Levinson claims that a Stamitz symphony containing a Manheim rocket—a novel device in Stamitz's day—is an exciting musical work, but a work written today with the same sound structure would be funny rather than exciting. Since the Stamitz symphony and the (hypothetical) contemporary sound-identical work differ in properties, it follows from the indiscernibility of identicals that they are distinct musical works.