I have been listening to "classical" music for many decades and it never ceases to amaze me how many popular tunes are direct "copies" of many of those composers. I suppose it is alright to "borrow" from dead guys who did not have the "protection" of modern copyright laws. One example of this is the sheet music for "All By Myself" that credits the lyrics and music to Eric Carmen. I cannot at this time recall the composer's name, but the music claimed to be written by and copyrighted by Eric Carmen is a note for note copy of that composer's work.