The example above features the characteristic “gon-gon, gon-gon” bassline typical of son. In this case it’s played on the Spanish guitar, but the pattern remains easy to recognize.
“Dame tu amor Guantanamera” by Eduardo Saborit—a classic son — the introduction features voice and tres guitar. Soon after, the characteristic bass line enters in the background. In this recording it’s played on an upright bass rather than a marímbula.