What will be the No. 1 song of the summer of 2020? We can officially begin making our way toward the answer, as Billboard's annual Songs of the Summer chart returns to Billboard.com today (June 3).The 20-position Songs of the Summer running tally tracks the most popular titles based on cumulative performance on the weekly streaming-, airplay- and sales-based Billboard Hot 100 chart from Memorial Day through Labor Day (this year encompassing charts dated June 6 through Sept.