The start of 2019 finds Crush Music's PANIC! At The Disco holding down that #1 spot with "High Hopes," but Halsey's "Without Me" (Capitol) and Ariana Grande's "thank u, next" (Republic) are gaining fast to challenge, as both clock in as the week's Greatest Gainers. Making a big leap up inside the Top 10 is Post Malone & Swae Lee's "Sunflower" (Interscope-Republic), while Zara Larsson's "Ruin My Life" (Ten Music/Epic) breaks the Top 20. New to the chart this week will be Post Malone's "Wow" (Republic) along with Lauren Daigle's "You Say" (Centricity/Warner Bros.).