What is four stringed guitar?

The four-stringed guitar, also known as the tenor guitar, was first introduced in the 1920s and became popular during the jazz age. It is a smaller version of the standard six-stringed guitar, with a fretted neck and four strings tuned in perfect fifths (usually C-G-D-A). The tenor guitar is often used in traditional Irish music, as well as jazz and blues music. It is also commonly used as a backup instrument in bluegrass bands. The size and tuning of the tenor guitar make it a versatile instrument that can be played in a variety of musical styles. Some popular tenor guitar players include Tiny Grimes, Eddie Condon, and Danny Gatton.