. >>> coming up, des pacito. opening up about the inspiration. was it the biebs?> i've never heard this song before. >> i really wish they'd play it more on the radio. ♪ despacito ul moments. switch to flonase allergy relief. flonase outperforms the #1 non-drowsy allergy pill. when we breathe in allergens, our bodies react by overproducing 6 key inflammatory substances that cause our symptoms. flonase helps block 6. most allergy pills only block one and 6 is greater than 1. with more complete relief you can enjoy every beautiful moment to the fullest. 6 is greater than 1 changes everything. ♪ thunder, hear the thunder ♪ lightning and the thunder ♪ thunder, thunder ♪ >>> so despacito clearly may not be on top of the charts anymore, but it will reign forever as the song of the summer. >> former ms. u with juju chang to talk about the song now that as manier is comi -- summer is coming to an end. >> reporter: it was inescapable song of the summer, dominating the charts, infecting our brains with this unforgettably catchy hook, capture the world's attention reaching n