Answer:
I can be repeated but rarely in the same way. I can't be changed but can be rewritten. I can be passed down, but should not be forgotten. What am I?
Who plays when he works and works when he plays?
Sing me to a baby about to go to sleep.
I produce wool and spit a lot
I am a portal to another world which you cannot enter. Only you can see me but I can't see you.
According to the music industry, you can count on a midnight train and the devil to turn up here.