According to Wikipedia:
"(Is This the Way to) Amarillo" is a song written by Neil Sedaka and Howard Greenfield, referring to Amarillo, Texas. It is about a man travelling to Amarillo to find his fiancée. The reason that Amarillo was chosen for the song was because it was the only place name that Sedaka could think of that rhymed with "willow" and "pillow".
Athough written by two Americans, the song became famous in the United Kingdom, and remains generally unknown in the United States.
The song was recorded by Tony Christie and released in the UK in November 1971 where it reached 18 in the UK Singles Chart. However, it was a substantially bigger hit at that time across Continental Europe, notably in Germany where it made number one. In the United States a version by Neil Sedaka made number 44 in the Billboard charts in 1977.
Neil Sadaka! I knew it sounded familiar...