These are the side Easter Eggs for Ascension, which includes a hidden soundtrack and several radios.

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Music Track
You will need to find the three Teddy Bears around the map to play the song. When you find one, you will need to press the X button, Square button or F key (Platform dependant) when on them. The bears can be found at the following locations:

Location 1 >> The second floor of the starting area
Location 2 >> On top of a wall near the Sickle
Location 3 >> Behind a fence near the Claymore Lunar Lander

The song played is called "Abracadavre" by Elena Siegman and Kevin Sherwood.

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Radios
Each radio will appear after you found the previous radio. The radios give a bit of back story to what happened at the space station before the zombie character came. When you find one, you will need to press the X button, Square button or F key (Platform dependant) when on them.. The radios are found at the following locations:

Location 1 >> Between the steps near the PhD Flopper Lunar Lander
Location 2 >> In a cage near the Claymore Lunar Lander
Location 3 >> In the starting area near some crates on the ground floor
Location 4 >> In the Pack-A-Punch room on some pipes down below
Location 5 >> Next to the Speed Cola and Matryoshka Doll
Location 6 >> Next to the Stamin-Up