Modern jazz uses triad chords a lot. I would like to know all possible triad substitutions over seventh chords, so I will also examine this in my thesis. What I hear and what I transcribed from modern jazz musicians is that they know the main music systems and the possibilities very well. I will listen to and transcribe solos from my favourite artists and find out what kind of scales and triad combinations they use. I will then examine these systems to discover what kind of triad chords there are and how we can use them in an irregular way. So my main question is, how can I use the concept of triad pairs to express the sound that is in my head?