I don't find it hard to understand why people are kicking this business about the Aug 2nd around . Before we all beat it to death. lets do ourselfself a favor and do a Google search for "Free music theory lessons for experienced musicians", don't let the word experienced scare any beginners off. There you will find a very easy to understand lesson called Intervals. The type is large, it is easy to understand, and you will be enlightened. Be sure to read the last paragraph since it will explain why there are so many different view points on this subject. Trust me people this site is right on & EASY to understand. also it is brief and concise. No fancy language or embilishments there. I would'nt steer you wrong to prove a point . This needs to be understood. I don't like to see so much time spent on such a simple piece of theory. Read it and move on. I took Music theory in 1972 in a Jr. college and we didn't spend more than a few minutes on this. For all those who say I'm wrong maybe you will take this man's word. :)