What Flavors in Reds?

[Auburnwine]

In preparation for a little tasting that I am hosting this weekend, I would like to let the tasters test their tasting skills.

I want to have a variety of aromas for them to practice on. I'd like to have containers of liquid with various aromas (white pepper, green bean juice, vanilla, coffee, plum, leather, etc.).

What are some key aromas that might be fun to practice with? (And I don't plan on cat pee or "barnyardy").