Interestingly picturing Alex's point of view on the world to a simple synth line and funny ("people who laughed at Portal's dark jokes" funny) lyrics.

Sound/Voice: Synthesizer (Not sure what type. Experimentation may be required)

() = Numbers in parenthesis are alternate octaves. Depends on your keyboard/piano.
Legend:
Uppercase (ACDFG) are the sharps (black keys right above the whites)
lowercase (abcdefg) are the whites.
Tabnabber has a full tutorial on reading piano tabs.

Verse (repeats several times)
5(4)|-c-c-c-c-A-A-A-A-|

Chorus (Let it rain down on me)
5(4)|-c-c-c-c-c-c-c-c-|