What is the technical term for the repeated low notes in "Soldier's Joy" played by Tommy Jarrell?

The repeated low notes in "Soldier's Joy" played by Tommy Jarrell are referred to as a drone. In musical terms, a drone is a sustained sound that accompanies melodic lines, typically providing a harmonic foundation. In folk and traditional music, drones create a rich, continuous sound that enhances the melodic elements of a piece.

In the case of "Soldier's Joy," the drone supports the melody and adds depth to the overall musical texture. This practice is common in various music genres, especially in traditional and folk styles, where instruments or vocal techniques emphasize sustained pitches underneath the main melody.

The other terms mentioned—riff, hook, and phrase—serve different functions in music. A riff generally refers to a repeated melodic or rhythmic line, often seen in modern genres like rock and jazz. A hook is a catchy musical idea, often used to make a song memorable, while a phrase is a complete musical thought or segment, akin to a sentence in language. None of these terms appropriately describes the specific function of the repeated low notes in this piece, which distinctly characterize the use of a drone.