'sall in the title really.

LCD Soundsystem - Yeah: The massive rave synth that comes in about half way through and goes all crazy.
Felix Da Housecat - Madame Hollywood: The bass synth, which is basically the whole song.
Mylo - Drop the pressure: Dum Dum Duh-dah, Dum-de-dum-dum-dum duh-dah
Postal Service - Nothing Better: The gameboy type bass one.
The Cure - The Walk: The bass synth, again.

I love bass synths.