Times like this I'd ask the keyboard what they are going to use and I'd do the same. That way we both will be together.Now, let's take the following a chord progression.
Cmaj7 I E7 I Am7 I D7 I Fmaj7 I G7 I Cmaj7 I Cmaj7 I
Cmaj7 I E7 I Am7 I D7 I Fmaj7 I G7 I Am7 I Am7 I
Is it C major or A minor?
With the first progression starting and stopping with the Cma7, and the Cmaj7-Fmaj7-G7 being so strong I'd use C major.
With the second progression the Cmaj7, Fmaj7, G7 again being so strong I'd have to stay with C major. A progression of I, iii, vi, ii, IV, V moves well with itself - iii like to go to vi and as a ii and IV being sub-dominant chords like to go to a dominant chord - which they do with the V. Why it does not resolve from there I can only guess that the song writer did not want to resolve. The vi is normally a neutral chord, perhaps the song writer wanted it this way.
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