In 1893, two sisters from Louisville, Kentucky, composed the song "Happy Birthday."
It makes approximately $5,000 per day in royalties and has amassed approximately $50 million since its inception.
Although being relatively new, Ed Sheeran's 2017 single "Shape of You" is one of the best-selling songs ever.
"Shape of You" was co-written by British musicians Steve Mac and Johnny McDaid and sold 42 million copies.
In 1973, Elton John and his co-writer Bernie Taupin created the song "Candle in the Wind."
In 2017, 'Despacito' was released and became the third best-selling single in history.
The song "Stand By Me" was written in 1961 by Ben E. King, Mike Stoller, and Jerry Leiber.
The song has been covered by more than 400 different musicians and is estimated to have made $27 million.
In 1955, Alex North and Hy Zaret composed the song "Unchained Melody" for the obscure film "Unchained."
It is projected that the song has made $27.5 million in revenue.