Seventh chords are the most common extension of the basic 3-note triad you come across.
A seventh chord is built by adding an extra note to a triad which is an interval of a 7th above the root note.
e.g. If you build a triad on C you will use the notes (C-E-G). If you add a another note a 7th above C then you will have C-E-G-B. You have just created a basic seventh chord.
THE 5 TYPES OF SEVENTH CHORDS
There are 5 types of 7th chord you will come across and want to use in your music. Each one gives a characteristic sound which will help you when composing music.
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You did not add any text, therefore it is unsolvable. It would be helpful to add the story and scene so that people who want to help you have something so work with.
As the paintings, this baroque art movement was EXTREMELY ornate with fabulous flourishes colored in lavish gold, really anything to show their wealth.