Echosmith released a holiday track "I Heard The Bells On Christmas Day" on December 3, 2013.
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The band performed song, Cool Kids, on December 31, 2013 during the Teen Nick Top 10: New Year's Eve Countdown, hosted by Nick Cannon.
Hayes and Mraz invited YouTube artists and other aspiring musicians Tessa Violet, Echosmith, TJ Smith, Tyler Ward, Brandyn Burnette, Brian Landau, Sam Tsui, Kina Grannis and Peter Hollens to share their covers of the song, and participate in a one-take mashup video.