Only one, but he'll go through a whole box of bulbs before he finds just the right one. You might notice that there are very few jokes about the clarinet. This is out of sympathy. The clarinet has already been the butt of so many jokes - the saxophone, for instance. One to change the bulb and four to contemplate how David Sanborn would have done it.
Lawn mowers sound better in small ensembles.
The neighbors are upset if you borrow a lawnmower and don't return it. Small wonder we have so much trouble with air pollution in the world when so much of it has passed through saxophones. One to handle the bulb and four to tell him how much better they could have done it. Government bonds eventually mature and earn money. I'm better than you.