Originally Posted By: swingbabymix
C F G C E Am Dm G
There is no Emaj in C major, but it feels good to put it in.

What is this called in English music terms?tonicisation？ or outside？

Does BIAB have an automatic function to help us choose more chords? Like a suggestion.

I find it quite interesting that you found and like that progression.

The first part is I IV V I, which is very conventional and is part of that common popular set of progressions using I IV V vi that I mentioned elsewhere (the Am is the vi).

The second half starts on a III, which is slightly unusual, but not very unusual (You will often see a III7 used), and the progression from it is III vi ii V and back to I. That III vi ii V I (or 3 6m 2m 5 1 if you prefer) is a stacked pair of ii V (or 2 5) movements around the circle of fifths, resolving to the I. That is the "moving key centres" that I also mentioned.

You might try a slight change and see if it also sounds nice to you.

C F G C E7 Am Dm G7 and back to the C.

Jazz relative beginner, starting at a much older age than was helpful.
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