Melody gives a piece of music richness and character. Melody also helps the listener remember and identify music. In most cases, it is the melody of a song that is the most memorable part. -Wikipedia A melody is a line of single notes. But that is just a silly definition. A melody is much more than that. A melody has to fit with the music, have some sort of rhythm and make the listener follow the notes. -www.musicianuniversity.com I came across these while listening to Soulside Journey and it got me thinking. How important is the melody in the more atonal types of metal? I'm talking about bands like Suffocation, Celtic Frost, early Immortal which write using only fifths. These bands, unlike Black Sabbath or Metallica, don't always use modal progressions, and some song melodies seem to be more or less random or chromatic. The melody doesn't harmonize or follow any recognized pattern, and it isn't always consonant with rhythm. It doesn't always "fit with the music" (whatever that means). So what would happen if we took a song like Circle of the Tyrants and totally randomized the melody (just the pitch, not the note duration)? Would it make much of a difference, or would the song be less enjoyable or memorable if we never heard the original? If yes, why is a random pattern of notes better than another? If no, what role does melody play in bands like these?