It’s no longer music in a cow pasture.Entering year 13 of the Bonnaroo Music Festival, visitors can enjoy attractions such as a digital movie theater, yoga and gardening classes, and even an upscale coffee shop. It’s all part of how the festival has evolved and incorporated new features over the years.The four-day festival gets under way with its first musical act Thursday at 3 p.m. and is scheduled to come to a close Sunday at 9:30 p.m. with a performance from Elton John. The festival has become a popular spot for Warren County residents, many of whom like to gather outside the Prater’s BBQ booth that’s in a prime location in front of the main stage.