The intro for Existentialism on Prom Night is just the chords split up. (F#m, 
E, and A.)

E----------------------------------------------------|
B----------------------------------------------------|
G--------2------------2-----------2-----------1------|
D------4---4--------0---0-------2---2-------2---2----|
A----4-------4----0-------0---2-------2---2------2---|
E--2------------0-----------0-----------0------------|

   F#m,         Dsus2,        E4,       E
Repeat as many times as needed, and the piano part is

E-------0-0---------------------|
B-2---3-----3-2-2---0-----------|
G---2-------------2---1---------|
D-------------------------------|
A-------------------------------|
E-------------------------------|