Their name may be a tribute to the word "phrygia" which was an ancient Greek city as well as the "phrygian mode" which is a common scale used frequently by classical composers. The phyrigian mode was used for some of the music of Super Metroid (the theme for Lower Norfair begins its motif in C Phrygian, continues to play the same motif in D# Phrygian, F# Phrygian, and A Phrygian, the key in which the rest of the piece is set (this theme is later used in the Magmoor Caverns in Metroid Prime). Additionally, the solemn piano/choir/flute theme heard in Brinstar is in D# Phrygian (alternating between the D# minor and E major chords).