The song "Yellow" came out in 2000 by the band "Coldplay."
Depending on the source, there are a lot of different origin stories for why the song is called "Yellow," as it really seems to have nothing to do with the song itself. Throughout the years, it had been attributed by Chris Martin, the lead singer of the band, to many things, including the yellow aura of a female friend of the band who was in the studio when they were recording the song.
In November 2011, Chris finally admitted that "yellow" meant nothing. He just couldn't find another word that could fill in for "yellow" and make any sense, so it stayed.