What is the lyre chords of boom panes?

The lyre chords of boom panes are a musical interval that is characteristic of the music of the ancient Greek lyre. The interval is a perfect fourth, which is an interval of five half steps. The interval is named after the lyre, a stringed instrument that was used in ancient Greek music. The lyre chords of boom panes are often used in traditional Greek folk music, and are also found in some modern popular music.