People might be talking about the cicadas, but in Pikesville, some fourth graders are singing about them.”It’s a cicada,” is the title of the No. 1 hit song going around the Krieger Schechter Day School in Pikesville, where music teacher Sara Fuld dusted off a song she wrote 17 years ago for a whole new brood to sing.”I did a lot of tweaks to it, changed some wording around and brought it out about two weeks ago for the