Question: The Spectrum Song was the signature song of the uncle of who?

Context paragraphs:
Candy Rain (song): "Candy Rain" is the title of a number-one R&B hit single by Soul for Real, released in 1994 on Uptown Records.  The song was written by Ali Shaheed Muhammad, Hamish Stuart, Dwight Myers, Malik Taylor, Owen McIntyre, Samuel Barnes, Jean-Claude Olivier, Terri Robinson and spent three weeks at number-one on the US R&B chart and peaked at number two on the US "Billboard" Hot 100 for three weeks behind Madonna's ballad "Take a Bow".  The song also reached #1 on Billboard's Top 40/Rhythm-Crossover airplay chart and was a moderate success on mainstream Top 40 radio, peaking at #21 in the spring of 1995 on Radio & Records CHR/Pop tracks chart.  It was certified gold by the RIAA and sold 800,000 copies.  It features rapper Heavy D in the video and the song is regarded as the group's signature song.  The song has a remix by Heavy D and samples the 1974 hit song "Mr. Magic" by Grover Washington, Jr..  Bruno Mars has covered this song during his The Moonshine Jungle Tour.  The bassline of this song was sampled from Minnie Riperton's "Baby, This Love I Have" which is the first song from her 1975 album "Adventures in Paradise".

Bodies (Drowning Pool song): "Bodies" (often called "Let the Bodies Hit the Floor") is a song by the American rock band Drowning Pool and also is the lead single from their debut album "Sinner".  Released in May 2001, the song is Drowning Pool's signature song and has been featured in various films, TV programs, and advertisements since its release.  It was also the theme song for the 2001 WWF SummerSlam pay-per-view event, as well as that of the ECW brand in 2006 to early 2008.  During 2001, the song got popular, but the song was taken off radio stations after the September 11 attacks because the song would've been inappropriate for the terrorist attack.

Dick Nolan (musician): Richard Francis "Dick" Nolan (February 4, 1939 – December 13, 2005) was a Canadian musician, born in Corner Brook, Newfoundland.  Nolan was known for performing Newfoundland folk music in Toronto night clubs.  During his 50-year career he released more than 40 albums and recorded over 300 tracks.  One album, "Fisherman's Boy", contained his signature song "Aunt Martha's Sheep" and went platinum in just three months.  Another signature song of his was "I's the B'y".  Two more gold albums followed and he appeared at the Grand Ole Opry and national television programs, was nominated for a Juno Award, hosted his own television series and in November 2005, was awarded the Lifetime Achievement Award from the Music Industry Association of Newfoundland and Labrador.

The Spectrum Song: "The Spectrum Song" was written by the Sherman Brothers in 1961 under assignment from Walt Disney to be a signature song for the fictional character Ludwig Von Drake.  Nominally about different colors in the spectrum, the song's lyrics initially consist of the repeated color names red, yellow, green and blue, but soon veer wildly off into cerise, chartreuse, ultramarine and plaid.

Dancing in the Street: "Dancing in the Street" is a song written by Marvin Gaye, William "Mickey" Stevenson and Ivy Jo Hunter.  It first became popular in 1964 when recorded by Martha and the Vandellas whose version reached No. 2 on the "Billboard" Hot 100 chart and peaked at No. 4 in the UK Singles Chart.  It is one of Motown's signature songs and is the group's premier signature song.  A 1966 cover by the Mamas & the Papas was a minor hit on the Hot 100 reaching No. 73.  In 1982, the rock group Van Halen took their cover of "Dancing in the Street" to No. 38 on the Hot 100 chart and No. 15 in Canada on the "RPM" chart.  A 1985 duet cover by David Bowie and Mick Jagger charted at No. 1 in the UK and reached No. 7 in the US.  The song was also covered by The Kinks, The Everly Brothers, Grateful Dead and Black Oak Arkansas.

Hello Darlin' (song): "Hello Darlin'" is a song written and recorded by American country music artist Conway Twitty.  It was released in March 1970 as the first single and title track from the album "Hello Darlin".  The song was Twitty's fourth No. 1 song on the "Billboard magazine" Hot Country Singles chart.  The song spent four weeks atop the "Billboard" Hot Country Singles chart that summer, and was named the No. 1 song of 1970.  Aside from being Twitty's standard concert opener, the song became a country standard as well as his signature song.  When performing with Loretta Lynn, Twitty would frequently sing the song directly to Loretta.

Ludwig Von Drake: Professor Ludwig Von Drake is one of Walt Disney's cartoon and comic book characters.  He was first introduced on September 24, 1961, as the presenter (and singer of "The Spectrum Song") in the cartoon "An Adventure in Color", part of the first episode of "Walt Disney's Wonderful World of Color" on NBC.  Said to be an uncle of Donald Duck.  He is described as a scientist, lecturer, psychologist, and world traveler.  The character displayed his "expert" knowledge on a variety of subjects in eighteen episodes of the classic anthology series, as well as on a number of Disneyland Records.

List of signature songs: A signature song is the one song (or, in some cases, one of a few songs) that a popular and well-established recording artist or band is most closely identified with or best known for, even if they have had success with a variety of other songs.  There have also been instances where a film actor has acquired a signature song by giving a popular vocal performance in a feature.  Signature songs can be the result of spontaneous public identification, or a marketing tool developed by the music industry to promote artists, sell their recordings, and develop a fan base.

An Adventure in Color/Mathmagicland: "An Adventure in Color/Mathmagicland" was the first color episode of Disney's long-running anthology series to air in color, premiering on September 24, 1961 as "Walt Disney's Wonderful World of Color" following the series' move from ABC to NBC.  This show introduced a new character, Ludwig Von Drake, who provides an interesting lowdown on color (at one point performing "The Spectrum Song", all about different colors).  By the end of the song, the NBC Peacock makes a brief cameo as a "color show-off".  The kaleidoscopic intro to the show featured music composed by Richard M. Sherman and Robert B. Sherman.  The second part of the show is the 1959 featurette "Donald in Mathmagic Land".

Risin' to the Top: "Risin' to the Top" is a song by Keni Burke.  Released in 1982 from the "Changes" album, its chart position was 63.  This song was sampled several times and is considered Burke's signature song.  It was also released on RCA Records.  The song was a defining hit for Burke, his best selling song, and showcases his work outside of Five Stairsteps.  It was produced by the same artist.  Along with the track "Hang Tight," the song was moderately successful, becoming a major hit for Burke, and it brought success to its parent album, being the album's only hit single.  "Risin' To The Top" had a very electronic feel, with drums over guitar, strings and keyboards, and it became Burke's best known track.

Supporting paragraphs: The Spectrum Song Ludwig Von Drake
Answer: Donald Duck