Simple Chicken Marinade

This is my favorite easy, savory chicken marinade for grilling ~ reminiscent of barbeque bought on corners on summer Saturdays. I suggest caution with the optional ingredients. Use a light hand ~ there's so much flavor in the balsamic vinegar other strong seasoning should be coordinated with care.

1/2 cup balsamic vinegar (I think any vinegar would suffice, but I like balsamic vinegar especially)
1/2 cup canola oil
approx. 1/2 teaspoon garlic salt

options:
approx. 1/2 teaspoon poultry seasoning
approx. 1 teaspoon rosemary (for a citrusy smell/taste)

Marinate chicken in a gallon-sized zip-lock bag or other closed container for at least an hour for best flavor before grilling.