The Maryland State Fair is trying to please all kinds of tastes with a concert lineup that spans decades and genres of musical performers. The annual “12 Best Days of Summer” at the Maryland State Fairgrounds will feature rapper Nelly, country music stars Niko Moon and Lauren Alaina, and legendary rockers, Styx during the fair’s last weekend, Sept. 9-11. Nelly plays Sept. 9, Niko Moon and Laura Alaina on Sept. 10 and Styx closes out the fair on Sept. 11. Tickets go on sale Friday at 10 a.m.