@Mac
A piece with internal modulations!. That may be a good way for me to look at it. Or rather, a piece with number of two five drills inside (in other keys) the master key of C.

@Cudo
Yes, I guess it's true. Just about any piece of music might start with the first chord being a chord (major or minor) built on the 2nd of it's scale.

To know that in Jazz it is common to end with a Maj 7th or a Maj 6th is a good thing for me to remember.

Thank you both

Woody - Sacramento