A live jazz duo changes the entire vibe of a cocktail hour. You want to secure your musicians at least four months out to ensure the good ones are available for your date.
Since this is a flat $600 expense, you can break that total into manageable pieces to keep your cash flow steady while you plan the rest of the party.
The intro window is a deadline, not free money. If you have a balance remaining after 18 months, the standard interest rate will apply to the remainder.