Question: Who sang for the wonders in that thing you do?
Disambiguated questions and answers: question: What are the names of the characters in the Wonders in That Thing You Do?
What are the names of the actors who play the characters in The Wonders in That Thing You Do?
Who from the candy butchers sang for the wonders in that thing you do?
answer: Guy Patterson, Jimmy Mattingly, and Lenny Haise
Tom Everett Scott, Johnathon Schaech, and Steve Zahn
Mike Viola
Natural Questions answer: Mike Viola (from the Wikipedia article "That Thing You Do (song)")