Both Arirang for Gayageums with 18 and 25 Strings and Guyun: El Maestro is written in 3/4. However, in Guyun: El Maestro, there is one place where time signature changes at bar 9 from 3/4 to 2/4. The effect of this is that the two quarter chords give a feeling of inclination move onto the next phrase that starts with 3/4 again.
