Let's talk generally, putting aside anything which has gone before in this thread (which despite the heat has surely got brains racking overtime ). An arpeggio is generally accepted to be a sequence of chord tones, ie the notes used to make up a chord, which are the odd-numbered notes in the major scale of the key - 1, 3, 5, 7, 9, 11, 13 15. For some reason these notes are generally known as tones. Here's a question. In jazz you might use a m7b5. The flat five is one of the key's chromatic notes. If you played the notes of this chord in a linear manner, would it be an arpeggio? Generally speaking. Where there's music theory discussion, there always a good chance of heat .