A note on how Quests can use different jobs or stop regular jobs from showing up.
A Quest can use a TEMPORARY JOB, which may be only for that part and may be similar to a Regular Job except that it uses a different time or location etc..
A quest can HIDE and LOCK a regular job, so you can't do that Job until you finish that part of the Quest.
In the case of We Don't Sell myPods part 1:
That LOCKS and HIDES the 4 hour version of Play The Sax for Lisa and uses a TEMPORARY 8 hour version.
When you finish that it removes the 8 hour version and the Regular 4 hour Job is UNLOCKED again.
The Quest then wants you to do the Regular 4 hour version 3 times, but does not tell you to do it.