first i'm in no way in the same company as Mario or Matt Finley, David Snyder or any of the other fine songwriters who are members of these forums
though i do enjoy composing mostly instrumental original material using my ears guitar & tools like this

which is why something like this is valuable

the reaultes of entering Cmaj Gmaj Am Fmaj as chords for a song like let it be and may others



presuming you had these chords in your song in some order you could then use biab/rb to experiment using the scales and additional chord suggestions

if you enter the notes of your melody instead you'll get suggested scales and chords to go with it

Chord Identifier (Reverse Chord Finder) is also useful


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