Now my questions. There is no bug_bot_music.cpp file. Matter of fact, the original sketch was copied and pasted out of a pdf file, so I don't have a .cpp with this sketch, as far as I know. Am I wrong to assume that a sketch doesn't have to have a .cpp file to compile correctly. And secondly, the pitches.h file is presently located in the library/tone directory, but evidently this new sketch is not finding it. So.....what am I doing wrong and where should I locate my files so the compiler finds them correctly.