"My Number One" is the 2005 winning song of the 50th Eurovision Song Contest being the 2005 Eurovision entrant for Greece performed by Elena Paparizou credited as Helena Paparizou. Written by Christos Dantis with English language lyrics co-written by Natalia Germanou, "My Number One" afforded the first victory to Greece in Eurovision.

The song is notable for casting elements of traditional Greek music in a contemporary dance music setting: its arrangement includes bouzoukis and a solo featuring a Cretan lyra. The song's lyrics describe the singer's appreciation for her lover who is lauded as "my number one" and "the only treasure I'll ever have".

Before Eurovision, ERT used an internal selection method to choose Paparizou. They chose her, and then had composers submit songs. They then picked 4 songs with Paparizou for her to sing at a Greek National Selection. At the Greek National Selection, Paparizou would have to sing the 4 songs, and the public would vote via televoting with a special jury, that would determine what song to send to Eurovision. The songs to pick from were "My Number One", "OK", "Let's Get Wild" and "The Light in Our Soul". Shortly before the Greek national selection, it was revealed that "The Light in Our Soul" was released by the artist Big Alice in Germany, which broke the rules. The song was then disqualifed from the selection prossess, leaving it to 3 songs to choose from.

1 (one;  /ˈwʌn/ or UK /ˈwɒn/) is a number, a numeral, and the name of the glyph representing that number. It represents a single entity, the unit of counting or measurement. For example, a line segment of "unit length" is a line segment of length 1.

One, sometimes referred to as unity, is the integer before two and after zero. One is the first non-zero number in the natural numbers as well as the first odd number in the natural numbers.

Any number multiplied by one is the number, as one is the identity for multiplication. As a result, one is its own factorial, its own square, its own cube, and so on. One is also the empty product, as any number multiplied by one is itself, which produces the same result as multiplying by no numbers at all.

The glyph used today in the Western world to represent the number 1, a vertical line, often with a serif at the top and sometimes a short horizontal line at the bottom, traces its roots back to the Indians, who wrote 1 as a horizontal line, much like the Chinese character 一. The Gupta wrote it as a curved line, and the Nagari sometimes added a small circle on the left (rotated a quarter turn to the right, this 9-look-alike became the present day numeral 1 in the Gujarati and Punjabi scripts). The Nepali also rotated it to the right but kept the circle small. This eventually became the top serif in the modern numeral, but the occasional short horizontal line at the bottom probably originates from similarity with the Roman numeral Failed to parse (Missing texvc executable; please see math/README to configure.): \mathrm{I} . In some European countries (e.g., Germany), the little serif at the top is sometimes extended into a long upstroke, sometimes as long as the vertical line, which can lead to confusion with the glyph for seven in other countries. Where the 1 is written with a long upstroke, the number 7 has a horizontal stroke through the vertical line.

Enrique Iglesias (born Enrique Miguel Iglesias Preysler; May 8, 1975) is a Spanish singer, songwriter and occasional actor, popular in both the Latin market and the Hispanic American market in the United States. He is the son of the famous Spanish singer Julio Iglesias. Within five years of beginning his musical career in the 1990s, he became the biggest seller of Spanish-language albums of that decade. He made his crossover into the mainstream English language market before the turn of the millennium, signing a multi-album deal with Universal Music Group for an unprecedented US$50,000,000 with Universal Music Latino to release his Spanish albums and Interscope to release English albums. In 2010, he parted with Interscope and signed with another Universal Music Group label, Universal Republic.

Iglesias has sold over 100 million records worldwide, making him one of the best selling Spanish language artists of all time. He has had five Billboard Hot 100 top five singles, including two number-ones, and holds the record for producing 22 number-one Spanish-language singles on the Billboard's Hot Latin Tracks. He has also had ten number-one songs on Billboard's Dance charts, more than any other single male artist. Altogether, Iglesias has amassed 55 number-one hits on the various Billboard charts. Billboard has called him The King of Latin Pop and The King of Dance. Billboard also named Enrique the number two Latin artist of the years 1986–2011 (Luis Miguel taking the first spot).