She said they began making a list of song ideas they could make into a toast medley, though she added Whitney Houston and Mariah Carey got nixed because of their "severe inability to hit the high notes."
Since Kelsey Hallerman lives in Los Angeles, and Maddie Hallerman lives in San Francisco, they only had a little bit of time to write the song and practice it.
"Essentially, what you see in the video is the first time we actually gave it our all," Maddie Hallerman said. "And yeah....we didn't hold back (sorry to everyone's eardrums). What we lack in talent we make up for in enthusiasm."