"That Thing You Do!" is not based on a true story, but it draws inspiration from the pop music scene of the 1960s, particularly the rise of one-hit wonders. The film, written and directed by Tom Hanks, follows a fictional band called The Wonders as they navigate fame and the music industry. While the characters and events are created for the film, the story captures the essence of the era and the challenges faced by aspiring musicians.

In the movie "That Thing You Do!", the song "That Thing You Do" is originally performed by the fictional band The Wonders. The lead singer of the band, Guy Patterson, portrayed by Tom Hanks, sings the song. The actual vocals for the song were recorded by Adam Schlesinger, the bassist of the band Fountains of Wayne, who wrote the song. The film, released in 1996, showcases the rise and fall of the band in the 1960s music scene.

Yes, Steve Zahn did sing in "That Thing You Do!" He portrayed the character Guy Patterson, the drummer of the fictional band The Wonders. Zahn, along with the other cast members, performed the songs featured in the film. The movie's music was produced by Tom Hanks, who also directed the film. The song "That Thing You Do!" became particularly popular and showcased the talents of the cast, including Zahn's vocal performance.

Yes, Tom Hanks' son, Colin Hanks, appears in "That Thing You Do!" He plays the character Chad, who is the drummer of the fictional band The Wonders. The film, released in 1996, was written and directed by Tom Hanks and focuses on the rise and fall of the band in the 1960s. Colin Hanks' role contributes to the film's exploration of the music industry and the dynamics within the band.