Finneas says working with sister Billie Eilish requires "total vulnerability"

Finneas O'Connell and his younger sister, Billie Eilish, have become household names. Recently, their collaborative work on the hit song "What Was I Made For?" from the "Barbie" movie has earned them nominations for "Record of the Year" and "Song of the Year" at the upcoming Grammy Awards.

The duo's small studio in the basement of Finneas' Los Angeles home is the birthplace of many of their songs together, including "Ocean Eyes," which went viral in 2015 and launched their careers.

Most of their songs together, including "What Was I Made For?" often come from spontaneous moments between the two in front of a piano.