He has learned what people general like to dance to and which songs they will enjoy. His expertise in this area can be very helpful. But the ultimate choice is up to the client. Overtime is always available. It is offered in 30 minute increments and can be arranged near the scheduled near the end of the original contracted time.
Overtime is equal to the same rate as contracted rate.
In fact, it is the policy of the Sound Spectrum for each client to meet their DJ before any contact is signed. After that, you will only be talking with him for all the event planning. This way, he will develop a strong connection with the client and this will help him understand everything you want done. This can be done without any problems. You DJ works for you and is under you control.