What I meant by descending 4ths is you are going around the cycle of 4ths in this way:
Start on any note, go down a perfect 5th, then up a perfect 4th, then down a 5th, up a 4th, and so on. Try that and you'll get it. The chord root movement is in 4ths.
Good idea to get the chart from Randy. But it's also a good idea to understand how the notes relate to the harmony and tonic center (key), especially if you need to transpose it to another key (for alto or tenor, for ex).JL, thanks for the reply and for your time, unfortunately I don't have the theoretical knowledge at this stage of my development to comprehend your explanation...:-(
Is there somewhere I can go to learn more about this ?