In the 1935 film "Top Hat", which Irving Berlin song was sung by Fred Astaire as he and Ginger Rogers danced?

"Cheek to Cheek" is a song written by Irving Berlin in 1934–35, specifically for the star of his then new musical, Fred Astaire. The movie was "Top Hat", co-starring Ginger Rogers. In the movie, Astaire sings the song to Rogers as they dance.

The song was nominated for the Best Song Oscar for 1936; it lost to "Lullaby of Broadway". The song spent five weeks at No. 1 on 'Your Hit Parade' and was named the No. 1 song of 1935. Astaire's 1935 recording with the Leo Reisman Orchestra was inducted into the Grammy Hall of Fame in 2000. In 2004, Astaire's version finished at No. 15 on American Film Institute's (AFI) 100 Years...100 Songs survey of top tunes in American cinema.

Music aficionados often say, "The song "Cheek to Cheek" is so meticulous crafted that it has become an international standard, and Berlin's melody has lingered on into the 21st century to become an elegance classic."