Billboard first published an Adult Top 40 chart in its March 2, 1996 issue. The first #1 song was “One Sweet Day” by Mariah Carey and Boyz II Men. The song to spend the longest at #1 was “Smooth”, by Santana (featuring Rob Thomas), which was #1 for 25 weeks in 1999 and 2000. The songs which spent extended periods of time atop the chart are the following:
25 weeks: “Smooth,” Santana featuring Rob Thomas (1999)
23 weeks: “Wherever You Will Go,” The Calling (2002)
18 weeks: “Unwell,” Matchbox Twenty (2003)
18 weeks: “Photograph,” Nickelback (2005–2006)
17 weeks: “Iris,” Goo Goo Dolls (1998)
16 weeks: “Complicated,” Avril Lavigne (2002)
15 weeks: “Don’t Speak,” No Doubt (1996)
15 weeks: “How to Save a Life” The Fray (2006–2007)
14 weeks: “Torn,” Natalie Imbruglia (1998)
14 weeks: “Everything You Want,” Vertical Horizon (2000)
14 weeks: “Drops of Jupiter (Tell Me),” Train (2001)