Nuclear Throne hosts a variety of music tracks to add either ambience or flair to an area/boss. There are a total of 35 tracks within the original soundtrack, though is split up into 36 within the game files.

All the music in Nuclear Throne was composed by Jukio Kallio who has repeatedly worked on soundtracks for Vlambeer titles - Luftrausers, Gun Godz and Yeti Hunter as listed on his website.

Within the game files each track is listed as an .ogg file. These are easy to replace via file editing(link later) so long as they share the same file format and name. The length of the track does not have to be the same at all when adding custom music.

Each song in game ends abruptly in order to loop smoothly while in the soundtrack it slowly fades out, so the length of tracks between the OST and in-game tracks differ. Some themes only play under specific conditions listed at the bottom of the page.

(These tables are sortable! Click any header to sort it by its grouping)

Alt Themes

B-Themes are alternate themes that can play in place of normal themes, for main areas that have three levels.
The first set of conditions is that it needs to be an area where a vault spawns on the second level of it. In preloop, this is the Scrapyards and Frozen City areas. In loop, this also includes the Desert and Palace areas. In Harmode, this immediately applies to all four areas since they all have vaults starting in H1.
If all three vaults are visited in a run, B-Themes will no longer play for the duration of that run as vaults no lonegr spawn. This does not apply to weeklies, since the vaults spawn in just in their damaged state, meaning that B-Themes always have a chance to play during those runs.
The second set of conditions is that B-Themes will always play if the character is currently at 1 HP(or 0 HP, in those rare situations). They also have a constant 5% chance to play if above 1 HP.

There are two tracks almost never heard in normal gameplay. The first of these is "The Place I Once Called Home", which is an alternative theme only heard when entering the IDPD HQ as Rogue, a unique track to tie her character into that area to give a more somber feel.

The other rare theme, "Campfire", is an easter egg that will play after the main menu theme finishes on the character selection screen, but only if the Vlambeer logo appears in the campfire. This is a very obscure easter egg and most players will go through the game without knowing about this track because of its obscure conditions.