I was just learning Mr Blue Sky by elo and i noticed all these chromatic notes in the chords. i thought it was pretty interesting how the song sounds so happy but has all those chromatic notes in there. how is that done? are there any articles or anything about chords with chromatic notes im pretty interested in it.
It's not a Gregorian Chant, you won't be hung for using notes out of key.
You probably want to learn more about voice leading.
Oh yeah.

Quote by hildesaw
A minor is the saddest of all keys.

EDIT: D minor is the saddest of all keys.