The 23rd concert étude by Christian Lauba, Pent is written for solo alto saxophone and dedicated to Zachary Pfau. 'Pent' refers to the prefix penta, meaning 'related to fives.' The subtitle indicates it is an "Étude for the mastery of fifths and large intervals, legato or slaps." 

This is a shorter étude by Lauba, but still very effective and full of his language and style. Advanced techniques include multiphonics, slap-tonguing, and flutter-tonguing. Fingerings for multiphonics are included in the score. The approximate duration is 3'.