Luis Fonsi & Daddy Yankee's unofficial Song of the Summer "Despacito" f/Justin Bieber (UMLE/RBMG/Def Jam/Republic) will continue to reign over the T40 chart for one more week, however Shawn Mendes' "There's Nothing Holdin Me Back" (Island/Republic) is coming on strong as it moves to the #2 spot. There are two songs joining the previously log-jammed Top 10 this week, DJ Khaled's "Wild Thoughts" f/ Rihanna & Bryson Tiller (We The Best/Epic) and Niall Horan's "Slow Hands" (Capitol). Calvin Harris' "Feels" f/ Pharrell, Katy Perry and Big Sean (Columbia) makes the leap into the Top 15 and Glassnote's Childish Gambino is poised to join as well with "Redbone." And Louis Tomlinson's "Back To You" (Syco/Epic) will be hitting the chart this week.