This is the name of one of the tracks on Pianologues
. A pianologue is "a performance at the piano, sometimes with a verbal accompaniment by the performer." This one is meant to be about divorce.
Many of the song titles that fill out Song Reader are references to older songs/sheet music. In searching, I did see a few songs called "Divorce" here and there, and there's a famous country song called "D.I.V.O.R.C.E." but there I didn't see enough evidence to think "Divorce?!" was a reference to anything. Too common a theme.