I often thought there should be a way to make music that actually have an intro at the beginning, so music can actually sound like something completely over the top. For example:
| = Intro Start
| = Loop Start
| = End
|---|------------|
When the music is first heard from the player, it would start from the intro start, and it would go on past the loop start up to the end, and when it loops, it would start again back at the loop start, and repeat endlessly.
This would be useful for deathmatch arenas, racetracks, etc. that would use music to enhance the experience. Instead of getting off at a sudden start, the music could finally be able to start slow and quiet before going into the real part without it sounding weird when it loops.
It could be made by making a zip file containing files such as the description, a sound file of the music from the intro start to the loop start, labelled "intro", and another one of the music from the loop start to the end, labelled "loop".