Music & Sound
The Black Mesa Official Soundtrack
"After seven years, hundreds of hours and too many song revisions to count, the Black Mesa Soundtrack is finally released. Faced with the impossible task of creating a soundtrack that will pay homage to Half Life 1 and the millions of fans worldwide, I have made production choices that some will most likely question. From a slightly different perspective, I have tried to bring what I feel is the essence of Half Life, to Black Mesa.
I had no prior experience composing soundtracks. Creating the sound effects was a challenge all on its own, but the music was a far greater task than I initially anticipated. Luckily for me, the lengthy development cycle gave me time to learn and experiment with a lot of different ideas.
I wanted to try new musical genres and styles in Black Mesa, while still maintaining a Half Life "feel". A few song re-makes were attempted, but there is no point in re-making something that is already a classic. I know I risk much composing a soundtrack so different, but I am hoping the community will come to like it almost as much as the original." (Joel Nielsen) 
(All tracks can be downloaded at the composer's website)
Some early renditions of the Black Mesa Soundtrack:
- Demo 5 (2005 - 2006): A very early version of which later turned to be the We've Got Hostiles theme. 
- On A Rail - Old Track (2012): Old On A Rail track which wasn't used in the final version of the soundtrack. 
- Surface Tension Theme: Renamed to "Surface Tension 1" in the final mix.
- WGH Topside: Renamed to "We've Got Hostiles" in the final mix.
- Blast Pit: Renamed to "Office Complex" in the final mix.
Sound effects and ambient sounds
- Joel Nielsen replaced most if not all hit sounds 
- The ambient/environment noise folder alone is about a 1 gig. 
- Jumping and landing on surfaces sound different for different materials (Jumping on a solid metal box will sound different than a hollow box). Many of the foot step sounds are also being replaced.