You can play along with the videos! The 2nd video is Grace Vanderwaal, the 12 year old girl who won America's Got Talent.
"Ex's & Oh's" achieved success in the rock genre, peaking at number 1 on the Billboard Hot Rock Songs chart, and later crossed over to adult pop radio. In June 2015, "Ex's & Oh's" was certified Gold by Music Canada; it has since been certified double Platinum. The song reached the top of the Alternative Songs chart in September 2015, becoming only the second song by a solo female to reach the top since 1996 after Lorde achieved the feat in 2013 with "Royals". The song also became King's first top-10 hit on the Billboard Hot 100. It also charted moderately well internationally, attaining top-10 peaks in Australia, Austria, and New Zealand, amongst others.
"Ex's & Oh's" received two nominations at the 58th Grammy Awards: Best Rock Performance and Best Rock Song.