1988 Number 1 mega-hit by anything but one-hit wonder Bobby McFerrin. Who, in case you never noticed, is whistling, humming, and singing every rhythm, harmony, melody, and sound in this entire song a capella.
And the central message is timeless: You can't control what happens, but you can control whether you're happy about it, or not. Be a thermostat, not a thermometer, especially in the current times, and what's to come. Be happy.