Compose a drumbeat. Create a tempo that is between 180 and 240 beats per minute. Utilize a double bass pedal and crash cymbal as much as possible. Use uncommon time signatures such as 10/4, 3/4, 7/4, 6/8, 9/8 and 10/8 as well as odd-numbered bar groupings for a more progressive sound. Go to the Drum Tracks website (See References) and listen to drum samples for ideas.
Compose a bass riff over the drumbeat. De-tune the bass to give it a darker and heavier sound. Tune the low E string down two whole steps so that it is a C. Continue to de-tune the rest of the strings down one whole step. This is called drop C. Tremolo or rapidly pick the strings in a minor scale and use chromatic notes. Play to the time signature set by the drums. Use a pick and a distortion pedal for a clunky, heavier sound.
Compose lead and rhythm guitar riffs over the drums and bass. De-tune the guitars to drop C as well. Utilize the highest distortion settings on your amplifier. Play in the same scale set by the bass and alternate between the root note and modes. Use power chords, octaves, and chord inversions. Go to the Guitar Master Class website (See References) for videos on death metal riffs.
Compose lyrics to the music. Think of a theme such as mythology, anger, angst, darkness or politics. Write a structure that includes an introduction, verse, chorus and outro. Include at least one section that repeats so that the riffs are memorable. Employ deep growl sounds and high-pitched screams when singing the lyrics.