Dr. Demento (AKA Barret Eugene Hansen) is a disc jockey and ethnomusicologist who achieved fame and/or infamy with his long-running syndicated radio program which features strange and bizarre novelty tunes of every type and description. Along with reviving popular interest in performers such as Music/SpikeJones and Music/TomLehrer, he introduced Music/WeirdAlYankovic to the world, which is pretty much a lifetime achievement in itself. Other performers often associated with his show include Music/DaYoopers, Music/NapoleonXIV, and Music/TheGreatLukeSki.

The show continues to air weekly via the Internet, and can be found [[http://www.drdemento.com here.]]

He is [[NoodleIncident reportedly]] one of [[WesternAnimation/TheSimpsons Bart Simpson's]] [[SitcomArchnemesis arch-enemies.]] Off the air, he has an extensive knowledge of music history, and has written articles, essays, and liner notes on a wide variety of music subjects.

!!Tropes associated with the good Doctor:

* AlliterativeName
* AntiChristmasSong: He usually devotes all of December to holiday music and these make up the majority of the playlists.
* {{Bowdlerise}}: Tends to SoundEffectBleep out naughty words on his broadcasts, including an epic version of Creator/GeorgeCarlin's [[SevenDirtyWords "seven dirty words"]] routine with a different effect for each word.
* TheCameo: Often turns up in Weird Al music-videos.
* ChristmasInJuly: An annual tradition on his show.
* EarlyInstallmentWeirdness: In his earliest shows he only played a few novelty records here and there but when he realized those were getting the most response from his listeners he decided to devote the majority of his show to them.
* FilkSong: He at least borders on this genre at times, calling it "Dementia".
* InnocentInnuendo
* {{Lobotomy}}: Topic of the song "I'd Rather Have a Bottle in Front of Me (Than a Frontal Lobotomy)." It's all in the title (which was originally a Music/TomWaits quote), but to recap: would you rather solve your problems with [[DrowningMySorrows alcohol]], or would you choose frontal lobotomy?
* MorallyAmbiguousDoctorate: Some of the songs he plays can probably cause brain damage.
* MorePopularSpinOff: How he got his start.
* NoHitWonder: Not Demento himself, but many of the bands he plays; DaYoopers are a prime example.
* RealSongThemeTune: The opening theme is "Pico and Sepulveda", originally recorded by Freddy Martin (under the name Felix Figueroa) in 1947, but eventually replaced with an instrumental version. The show closes with the 1928 song "Cheerio, Cherry Lips, Cheerio" by Scrappy Lambert.
* SigningOffCatchPhrase: "Stay demented!"