of Scrooge McDuck comics spawned an entire mythology around the character, including new supporting characters, adventures, and life experiences as told by numerous authors. The popularity of the Duck universe – the fandom term for the associated intellectual properties that have developed from Scrooge's stories over the years, including the city of Duckburg – has led Don Rosa to claim that "in the beginning Scrooge [owed] his existence to his nephew Donald, but that has changed and today it's Donald that [owes] his existence to Scrooge." In addition to the many original and existing characters in stories about Scrooge McDuck, authors have frequently led historical figures to meet Scrooge over the course of his life. Most notably, Scrooge has met US president Theodore Roosevelt. Roosevelt and Scrooge would meet each other at least three times: in the Dakotas in 1883, in Duckburg in 1902, and in Panama in 1906. See Historical Figures in Scrooge McDuck stories. Based on writer Don Rosa's The Life and Times of Scrooge McDuck, a popular timeline chronicling Scrooge's adventures was created consisting of the most important "facts" about Scrooge's life. See Scrooge McDuck timeline according to Don Rosa. In 2014, composer Tuomas Holopainen of Nightwish released a conceptual album based on the book, The Life and Times of Scrooge McDuck. The album is titled Music Inspired by the Life and Times of Scrooge. Don Rosa illustrated the cover artwork for the album. In other media Although first established as a character in the comic books, Scrooge has also appeared in various other mediums. Carl Barks created an earlier film prototype of Scrooge while working as the lead story man (writer/designer) of the early Donald Duck cartoons. The prototype featured in the animated short, The Spirit of '43. Scrooge's voice was first heard on the 1960 record album Donald Duck and His Friends; Dal McKennon voiced the character for this appearance. It took the form of a short dramatization called "Uncle Scrooge's Rocket to the Moon," a story of how Scrooge builds a rocket to send all his money to the moon to protect it from the Beagle Boys. In 1961 this story was reissued as a 45rpm single record entitled "Donald Duck and Uncle Scrooge's Money Rocket." Initially, Scrooge was to make his animated debut in the Donald Duck theatrical cartoons. Late in 1954, Carl Barks was asked by the Disney Studios if he would