1968 Harry Nilsson single, later performed by Three Dog Night
Also known as One is the loneliest number
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"One" is a song by American singer-songwriter Harry Nilsson from his third studio album Aerial Ballet (1968). It is known for its opening line "One is the loneliest number that you'll ever do". Nilsson wrote the song after calling someone and getting a busy signal. He stayed on the line listening to the "beep, beep, beep, beep..." tone, writing the song. The busy signal became the opening notes.