When Austin's cumbia-funk institution Grupo Fantasma went to record their seventh album at a studio in Tornillo, Texas, they had no idea that right next door was a tent city for detained immigrant youth operated by ICE. When they found out, they decided they had to do something. So they teamed up with fellow legends Ozomatli and Locos Por Juana to create a sinister funk tune with a message about the walls that divide us. On this edition of How I Made It, members of Grupo Fantasma break down the creative process behind their new song "The Wall."