Simone,
I believe I understand now. Perhaps the circle of fifths chart will help some time in the future. For example, you know that a song is 1,4,5, but you don’t know off the top of your head what chords need to be played for a particular key.
Here is an example of how you can use the chart. Let’s say that you want to play in C a 1,4,5 progression
- Note the C on the chart.
- Look one space to the left of C and you see F. There’s your 4. The 4 (F) is always one space left of the C.
- Now look one space to the right of C. There’s your 5. The 5 (G) is always one space right of the C.
Now, let’s say you want to play a 1,4,5 in D.
- Note the D on the chart.
- Look one space left on the chart, and you see the G, there’s your 4.
- Look one space right on the chart, and you see the A, there’s your 5.
So, you can always easily find the 4 and 5 when you know the key using this chart. Hope you find this helpful.
Jack