Those of you who lived in the DC area in 2004 remember all the hubbub about the 17-year cicadas (who were making quite a hubbub themselves that summer). But you don't have to wait until 2021 to see another cicada -- some come out every summer.
Different species each have a different sound, which helps them to find appropriate mates. Three of the earliest to come out in the Mid-Atlantic area are Neocicada heiroglyphica (sound), Tibicen lyricen (sound) and Tibicen tibicen (aka chloromerus) (sound).
Because they're active mostly at night, and up in the treetops, it's not that common to actually see cicadas. The ones we've seen most have been either a) molting or b) bird food. But keep an ear out and you're sure to hear some soon in the evenings.