For vocalists in Western music traditions, the steps of a major scale (doesn’t matter the key) go by the names Do Re Mi Fa So La Ti Do instead of just 1 2 3 4 5 6 7 8 the way most other musicians refer to them.
They are saying that in the song ABC by the Jackson Five, the notes they sing in that relative key when they say “Do Re Mi” are actually “So La Do”
For vocalists in Western music traditions, the steps of a major scale (doesn’t matter the key) go by the names Do Re Mi Fa So La Ti Do instead of just 1 2 3 4 5 6 7 8 the way most other musicians refer to them.
They are saying that in the song ABC by the Jackson Five, the notes they sing in that relative key when they say “Do Re Mi” are actually “So La Do”