The Andalusian cadence is a popular chord progression often used in genres like rock and flamenco. It involves four chords that descend stepwise and can be played using either the Phrygian or Aeolian mode. Although it's not a true cadence, it's frequently used as an ostinato, meaning it repeats over and over again. The sequence may have originated from Ancient Greek music and was later adopted by the Moors in Southern Spain. It became popular in the Renaissance era and can be heard in Claudio Monteverdi's choral work, Lamento de la Ninfa.
For those interested in exploring the Andalusian Cadence further, there are plenty of music pieces and songs composed using this popular chord progression. Check out the following articles to discover more about the history and influence of Andalusian music.