As the title says, only three tracks is a bit less.

Currently the major problem is the track size. Each track file is about 3mB and more tracks will cause the mod size to increase dramatically.

I actually plan to do some in-mod track download mechanism, but not too soon (Currently major working on the in-mod tutorial). So more tracks will probably come after that.

Track customization is also planned in case you are wondering.

EDIT: Jukebox tracks are indeed a good propose. We'll sort that out.

well, it is interesting.
I think ogg or mp3 will be enough for do it.
(oggs are used in some Mods)

Implemented in 1.0.0 and will get closed when it is released.

EDIT: I mean the ability to customize media. Vanilla tracks are not there yet.

Wow!