Sia, Kelly Clarkson, Josh Groban & Jane Lynch Land First Songs of the Holiday Season on AC Chart

Rich Fury/Invision/AP
Sia performs at Shining a Light: A Concert for Progress on Race in America at the Shrine Auditorium on Nov. 18, 2015 in Los Angeles. 

It's beginning to look (at least a little) like Christmas on the survey.

AC radio unwraps its first holiday hits of the season, as four festive songs jingle onto Billboard's Adult Contemporary airplay chart (dated Dec. 2).

Sia debuts at No. 19 on AC with "Santa's Coming for Us," followed by Kelly Clarkson's "Christmas Eve" (No. 21), Josh Groban's cover of John Lennon's "Happy Xmas (War Is Over)" (No. 23) and Jane Lynch's "A Swingin' Little Christmas," featuring Kate Flannery and Tim Davis (No. 28).

The Adult Contemporary chart measures total weekly plays, as tabulated by Nielsen Music, among its reporting panel of 84 AC stations.

Each year, even before Thanksgiving, much of the AC panel begins transitioning to playing holiday music 24/7 through Christmas, a trend that began around the early 2000s. Since then, 20 seasonal songs have topped the AC chart (with newly-released holiday titles or those being promoted to the format for the first time eligible for the survey).