The imperative mood!

[Mad-ox]

Is the following sentence correct grammatically?

'Sing to us, Mr. John!' shouted someone from the crowd.



Context:
[The event took place at a concert. Mr. John had such a nice voice that when he finished his show someone from the crowd shouted the sentence above.]

 

[Rover_KE]

Yes!

 

[Tdol]

Is John his first name or family name?

 

[Mad-ox]

Is John his first name or family name?

first name

 

[konungursvia]

But both are possible, Mr. Frodo.

 

[Tdol]

first name

In that case, I wouldn't use Mr.

 

[5jj]

When I worked in Oman, the students were required to address us as 'Mr John/Ms Marie/Dr Andrea'. I didn't like it, but that was the rule.