Premise: "Sara" is a 1985 song recorded by the American rock band Starship which reached number-one on the U.S. "Billboard" Hot 100 chart on March 15, 1986. It was sung only by Mickey Thomas, of the newly renamed band Starship, from their first album "Knee Deep in the Hoopla"; for this single, Grace Slick only provided the backing vocals.
Hypothesis: Grace Slick sang the song Sara and Mickey Thomas provided backing vocals.