Live 1969. This was written by Harry Nilsson, a popular songwriter who had hits as a singer with "Everybody's Talkin'" and "Without You." Nilsson was inspired to write "One" from the rhythm of a telephone busy signal that he kept hearing. This was the first song on Three Dog Night's first album. It was one of 21 US Top 40 hits for the group, who did very well with songs written by other artists. Other hits by Three Dog Night include "Joy to the World" (written by Hoyt Axton), "Mama Told Me (Not to Come)" (written by Randy Newman) and "The Show Must Go On" (written by Leo Sayer). This is about loneliness. It was used in the film Recess: School's Out when the character of TJ is lonely and bored after all his friends go to summer camps.