The song from the Left 4 Dead 2 TV Spot is "Electric Worry" by "Clutch". I'm assuming the lyrics you heard were:
"Bang, bang, bang, bang! Vamanos, vamanos! Bang, bang, bang! Vamanos, vamanos!"
Don't worry, the rest of the song has other lyrics, not just those repeated words.
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Bullet With Butterfly Wings by Smashing Pumpkins
Yes there is split screen for left 4 dead 2.
4 players can play in Left 4 Dead 2.
It is a Key that will unlock the Left 4 Dead 2 in your steam library
You can purchase The Sacrifice DLC for Left 4 Dead 2, which has you play as characters from the first game. Additionally, you can put character skins of the original characters onto the characters of Left 4 Dead 2 (Only in the PC version)