I'll often hear tunes in which the first note is upbeat and the second is downbeat. When is it syncopation and when is it not? For one of many examples, take "Amazing Grace." The "A-" is a weak beat and "-mazing" the strong beat. Yet I hear others claim that this is not syncopation. Or take "Somewhere Over the Rainbow" in which the second note jumps a full octave. "Some-", which is the first note, is weak, and "-where" is a downbeat. Isn't that syncopated?
Others claim that I don't understand the principle but yet are not able to explain what I don't understand. I sure need help on this one. Incidentally, I play the clarinet and sax at the intermediate level, and beginner's piano.