The song is sung by Maximum The Hormone.
The song is called "What's up, people!" by "Maximum the Hormone".
Regretably, Matt did not have enough screen time to have his own theme. There are many fan theme's though that you can find on youtube.
Be more specific....... if you check on itunes there is a CD called cosplay memories featuring Light's and L's theme DeathNote OST is also a CD with all the songs from death note......
The World- Nightmare
Nightmare (1st theme)and Maximum the hormone (2nd theme)
First season - nightmare "The World" Second season- maximum the hormone "What's up people"
It's Taiji from Death Note OST III
Nightmare.
maybe the ones posted on the computer are wrong p.s. I LOVE DEATH NOTE!!!! <3
Limewire. or here: http://kibikibi.wordpress.com/2006/11/05/the-world-death-note-op-full-size-lyrics/
Opening Theme:"Dani California" by Red Hot Chili PeppersEnding Theme:"Snow ((Hey Oh))" by Red Hot Chili Peppers
a J rock band named nightmare! they're awesome!!