The San Francisco Giants, NPR, the NCAA, and Intel are among the organizations that have enjoyed John’s performances. In 2018, he was honored to perform for United States Senator John McCain's funeral service. He has recently performed in the concert series hosted by arts organizations including the Phoenix Guitar Society, the Paradise Valley Chamber Music Collective, Oh My Ears, and the Pinnacle Concert Series. Successful concerts for the Phoenix Center for the Arts, Music Instrument Museum, and the David Lloyd Wright House have built up John’s reputation for making sophisticated art music accessible to audiences of all musical backgrounds. This has led John to unique performance opportunities such as sharing a concert with Billboard Top 100 artist Jordin Sparks. In 2017, Arizona Gov. Doug Ducey invited John to perform for the many U.S. governors and foreign dignitaries of the Western Governors Association.

In addition to his solo playing, John has been a part of outstanding performing ensembles.  Together with flutist Karina Nuñez, the Oeth-Nuñez Duo performed throughout Memphis and recorded Francia y Argentina, a collection of French and Argentine music. John has performed as a soloist for the Starkville Symphony Orchestra and the University of Memphis Opera.  Alongside guitarist Andrew Lesley Smith, Petrichor Duo has given many notable concerts and premieres. As avid players of accessible new music, Petrichor Duo is a catalyst for new compositions for guitar duo. Composers such as Robert Springer, Kohei Kondo, and Zach Jones have written and dedicated works to Petrichor Duo.

John is an advocate of 21st century guitar compositions as well as underperformed Renaissance lute and vihuela works. Compositions have been dedicated to him by international artists including Petrichor, a piece gifted by Japanese composer Kohei Kondo. He has premiered and released recording premieres of monumental works like the massive 21-movement Sketchbooks by Michael Karmon. This work is featured on his solo album, Sketches, which is a collection of works by contemporary composers all in the genre of a sketch. John’s doctoral dissertation focuses on the lute works of Vincenzo Galilei, Galileo’s father. John’s album Castles of Spain features the music of Federico Moreno Torroba including his popular Castillos de España which depicts varying castles throughout Spain. Fronimo, Oeth’s 2019 album of his arrangement of Galilei’s 26 Ricercari in all of the Renaissance modes. In March 2020, John began work on his well received album Final Fantasy Guitar Collection which features 46 guitar arrangements from the popular video game series. This newfound love of arranging has inspired John to dedicate his new work to making guitar arrangements of anime and video game soundtracks.

 John has studied with some of the world's top concert artists.  He is a former student of Frank Koonce, Michael Patilla, and Lily Afshar. He has performed in masterclasses for Judicaël Perroy, Paul O’Dette, and Pavel Steidl, among others. A graduate of Mississippi State University with a master’s degree from the University of Memphis, John completed his Doctor of Musical Arts at Arizona State University in 2020.