"Irreplaceable" is a popular song by Beyoncé, an American singer and actress. The song is in the key of E-flat major. It was released in 2006 as the third single from her second studio album, "B'Day." "Irreplaceable" was written by Ne-Yo and produced by Stargate and Beyoncé herself. The track topped the charts in several countries and became one of Beyoncé's signature songs. It features a mid-tempo R&B and pop sound with catchy melodies and relatable lyrics about empowerment and self-worth in a failing relationship. The chorus, "To the left, to the left," has become an iconic line from the song, often referenced and parodied in popular culture.