Loop time frame of audio

I have a sound track that has an intro but also a section of it that can be looped.
For example I have music that is 1:00 long.
The loop is from 0:30 to 1:00

How would I get a sound or sound cue to play from 0:00 to the end of the loop, and then loop back to 0:30 (being the start of the loop section)?