"One is the loneliest number." ~ Three Dog Night

One is the loneliest number that you'll ever do
Two can be as bad as one
It's the loneliest number since the number one

No is the saddest experience you'll ever know
Yes, it's the saddest experience you'll ever know
`Cause one is the loneliest number that you'll ever do
One is the loneliest number, worse than two

It's just no good anymore since she went away
Now I spend my time just making rhymes of yesterday

One is the loneliest, number one is the loneliest
Number one is the loneliest number that you'll ever do
One is the loneliest, one is the loneliest
One is the loneliest number that you'll ever do
It's just no good anymore since she went away
(Number) One is the loneliest
(Number) One is the loneliest
(Number) One is the loneliest number that you'll ever do
(Number) One is the loneliest
(Number) One is the loneliest
(Number) One is the loneliest number that you'll ever do

YouTube video:
One (Is The Loneliest Number)
by Three Dog Night
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"One" is a song written by Harry Nilsson and made famous by Three Dog Night whose cover in 1969 reached number 5 on the Billboard chart. The song is known for its opening line "One is the loneliest number that you'll ever do." It appeared initially on Aerial Ballet, Nilsson's third album. Wikipedia: One (Is the Loneliest Number)