Night Ranger 004
They do in this case, as drummer for Night Ranger Kelly Keagy, both wrote and sang "Sister Christian."

The original title was "Sister Christy," but the rest of the band thought Kelly was singing "Sister Christian," so that became the title.

The song is about his sister Christy, who is 10 years younger than him and was growing up fast. Essentially the song is about her coming of age. The vocalist on most Night Ranger songs was Jack Blades, but Keagy sang lead on this one.