Joe Penna (born May 29, 1987 in São Paulo), known online as MysteryGuitarMan, is a Brazilian guitarist, animator, and filmmaker. He currently resides in Los Angeles, California.

Penna maintains a popular channel on YouTube by the name of MysteryGuitarMan. He usually uploads videos every Thursday.

In January 2011, he was the most subscribed in Brazil. As of May 2012 his channel has over 2.1 million subscribers, and his videos have been viewed over 315 million times.

On February 18, 2010, Penna started a second YouTube channel, jp, where he uploads his making-of videos and vlogs. Within 6 hours, it became the third most subscribed channel in Brazil.

In 2007, Penna received media coverage, including attention from DC Fox News, after his "The Puzzle" video was featured on the front page of YouTube.

In 2009, Penna was again seen on the front page of YouTube with his "Guitar: Impossible" video, which has been covered by De Wereld Draait Door, the highest-rated primetime show in the Netherlands. On December 6, 2009, Penna was featured on FM4, an Austrian national radio station. Shortly after uploaded, his "Guitar:Impossible" video was featured on the MSN.com front page.

Michael Joseph Jackson (August 29, 1958 – June 25, 2009) was an American recording artist, entertainer, and businessman. Often referred to as the King of Pop, or by his initials MJ, Jackson is recognized as the most successful entertainer of all time by Guinness World Records. His contribution to music, dance, and fashion, along with a much-publicized personal life, made him a global figure in popular culture for over four decades. The seventh child of the Jackson family, he debuted on the professional music scene along with his brothers as a member of The Jackson 5 in 1964, and began his solo career in 1971.

In the early 1980s, Jackson became a dominant figure in popular music. The music videos for his songs, including those of "Beat It", "Billie Jean", and "Thriller", were credited with transforming the medium into an art form and a promotional tool, and the popularity of these videos helped to bring the relatively new television channel MTV to fame. Videos such as "Black or White" and "Scream" made him a staple on MTV in the 1990s. Through stage performances and music videos, Jackson popularized a number of complicated dance techniques, such as the robot and the moonwalk, to which he gave the name. His distinctive musical sound and vocal style influenced numerous hip hop, post-disco, contemporary R&B, pop and rock artists.