The song completes one of the longest climbs to the top.
Surf Mesa scores his first No. 1 on Billboard's multi-metric Hot Dance/Electronic Songs chart (dated Oct. 10), as "ily," featuring Emilee, who also earns her inaugural leader, rises 2-1.
Hitting the top in its 30th chart week, "ily" earns a share of the third-longest climb to No. 1 dating to the chart's January 2013 inception, tying Lillywood and Robin Schulz's "Prayer in C," in 2014-15, and trailing only Disclosure's "Latch," featuring Sam Smith (47 weeks, 2013-14), and Clean Bandit's "Rather Be," featuring Jess Glynne (37 weeks, 2014).