Guitarra séptima

The guitarra séptima or Mexican seven-course guitar is a historic variant of the Mexican guitar which reached its peak popularity in the 19th century. During the 19th century, Mexican composers created works for the instrument. The instrument fit a need in music, able to drop into low notes not attainable on a regular 6-string guitar.

While 7-string guitars exist elsewhere, Mexico developed its own tradition. The instrument can still be seen in southern Mexico in "mestizo ensembles" of "violin, mandolin and guitarra séptima." It was also associated with the Mexican typical orchestra.