If you’re looking for a fun, music-filled, slightly rowdy, yet totally unforgettable way to celebrate your 40th birthday, Nashville is the perfect spot. In fact, that’s where I just celebrated my big 4-0 with a group of girl friends and some hubbies. We had the absolute best time, so I want to share our Nashville itinerary for those who want to do a little bit of everything. Nashville is packed with live music, incredible restaurants, rooftop bars, and plenty of places to toast to turning 40. Whether you’re celebrating with friends, your partner, or a mix of both like I did, here’s how to make the most of a long…