"She's My Rock" is a song written by Sharon K. Dobbins.
It was first recorded by Stoney Edwards and released as a single in 1972.
20 on the Billboard Hot Country Singles chart.
In these cases, the song becomes "He's My Rock", with the genders changed as appropriate.
Regardless of the song's title—either "He's My Rock" or "She's My Rock"—the song retains the same subject matter: A person who is aware of the seedy past of his/her now-spouse and—when confronted with the facts—strongly defending him/her and warning the antagonist to back off because of his/her own unflattering character.