1) Start up the zombie map TranZit.
2) Open up the door from the starting room and go outside.
3) You will see a bench in a bus station.
4) You will find a teddy board on the bench.
5) Crouch near it with your reticule over the teddy bear and hold X until you hear a sound.
6) Next go to the farm which is the third bus stop.
7) The next teddy bear can be found in on the farm.
8) Go upstairs and the teddy bear will be set on a blanket.
9) Crouch near it with your reticule over the teddy bear and hold X until you hear a sound.
10) Next go to the town.
11) Go to the building where a perk can be purchased.
12) You will notice a pool table.
13) The teddy bear will be very close to the pool table.
14) Crouch near it with your reticule over the teddy bear and hold X until you hear a sound.
15) The unique song for this map will now activate.

Here is a video tutorial: