Answer by taking a quote from the following article:

Rhett & Link are an American Internet comedy duo consisting of the two YouTube users Rhett James McLaughlin (born October 11, 1977) and Charles Lincoln "Link" Neal, III (born June 1, 1978). Self-styled as "Internetainers" (from "Internet" and "entertainers"), they are known for their online viral videos, comedy songs, ten-episode TV series Rhett & Link: Commercial Kings for the Independent Film Channel, their daily morning talk-show titled Good Mythical Morning (GMM), their YouTube Red series Buddy System, and more recently, their YouTube channel "This Is Mythical." In their 2008 documentary, Looking for Ms. Locklear, they chronicled their search for the first grade teacher in whose class they met for the first time. All their work is put under their one banner name, Mythical Entertainment.

Rhett and Link perform live musical comedy and have completed two albums. In 2001, Rhett and Link independently released Just Mail Us the Grammy, featuring the popular song "The Unibrow Song". In 2005, Rhett and Link independently released I'm Sorry, What Was That? (Live in the Living Room), a live album featuring "The Wal-Mart Song". The album is available at the iTunes Store. In April 2007, Rhett and Link placed 3rd in the TurboTax TaxRap Contest, a contest judged by Vanilla Ice. In 2008, Rhett and Link independently released Websongs Vol 1, an online album featuring "Facebook Song", "Cornhole Song" and "Velcro Song". On February 1, 2009 Rhett and Link independently released Secret Songs, a collection of songs that were previously only available to winners of their monthly "Community Building Exercises", a part of their "Quest for the Seven Keys" contest.  On December 4, 2009, Rhett and Link teamed up with DFTBA Records and created a new album called Up To This Point.  In May 2015, Rhett and Link released a new album with the songs from their series, "Song Biscuits", which involved them writing a song with a guest (or just themselves) within an hour and performing it. This album is entitled Song Biscuits: Volume 1 and is available on iTunes.  To correspond with their YouTube Red show, Rhett & Link's Buddy System, the duo released the album Buddy System (Music From Season 1) which includes seven songs, one from each episode. It was released a week before the premiere date in October 2016 and is available on Google Play Music and iTunes.  Rhett and Link have also released all of their albums and singles onto Google Play Music.

What kind of music genre are Rhett and Link?
Rhett and Link perform live musical comedy