If you happen to be in City Hall Park around noon, you might hear someone shout through a bull horn, “It’s Never too late to say sorry.” If you step on the right grate in Times Square, you’ll hear a harmonic whirring that has nothing to do with Con Ed. Those colorful blobs on the benches of Madison Square Park? They’re not just weird visual candy. Go near them, touch them even!, and they’ll emit an eerie hum. With these and other such sound-filled works popping up in parks around New York, as well as seemingly random locales, the city has never seemed more abuzz with sound art. Because we don’t want you to miss out, here is a brief virtual jaunt through some of our favorite works currently on view. But we suggest you opt for the real thing as what’s missing in this slideshow is, well, the sound.