#include pitches.h in Melody

Hi - I have read the whole of a previous thread on this topic but I cannot get it to work.
#include pitches.h, #include “pitches.h” and #include “c:\This Pc\Documents\Arduino\Melody\pitches.h” all tell me that the compiler can’t find that file. I have it in half a dozen folders now including the Melody folder, the sketches folders etc. From what I understand from what I’ve read, it should be in the Melody folder and I have only one of those (other than the one in the Learn folder which I am not using).
I am using Windows 10 and IDE 1.6.5.
Naturally, the sketch works if I copy and paste all the note definitions into my own sketch but how do I get the #include to work as I’d expect, please?