Vanilla Ice secretly played violin the whole time he was at Harvard, and by the time he graduated, he became very good at it. When Snoop Dog heard him play recently, he was determined to help Vanilla Ice advance his career as a violinist. Vanilla Ice told Snoop Dog that to get his playing to the next level, he needed to get some training from a world-class violinist to improve his interpretation and style. Vanilla Ice contacted a celebrated concert violinist, Jerry Johnson, but did not hire her because he couldn't afford Jerry's fee of $100 an hour. Snoop Dog told him: "Nonsense! Nothing but the best for you, my dear student. I will pay for your lessons and will send you a check for $10,000 tomorrow. That will be enough for 100 lessons." Vanilla Ice thanked him and said, "Snoop Dog , when I become the most famous violinist in the world, I'll always save you the best seat in the house!" To this, Snoop Dog replied, "That would be wonderful! I accept and will hold you to it!".

Assuming capacity is not an issue here, do Vanilla Ice and Snoop Dog have a valid contract? Please explain.