G.I. Blues

 is a quest in Fallout: New Vegas.

Quick walkthrough
The King wants to know why Orris is getting lots of money.

The player must hire Orris, and note anything weird in his activity.

Orris fakes attacks on his clients, for easy fame.

After, The King asks you, to spy a bit on NCR activities.

Optionally, you can talk to Julie Farkas about the aid service there

NCR is doing suspicious activity at the east of Freeside. The locals are rumouring about free water and food. You get inside the building where they are giving the supplies, and find out that they're just giving food to NCR residents. (If you did the optional part, it turns out that they wanted to talk about things with The King, but the commissary were beaten up.) If you did the optional part, The King will mention that he is willing to strike a deal with the NCR.

Pacer sets up a fight with the NCR, and The King advises you to try and halt the NCR by letting them know he had no part in the beating of the messenger originally sent to strike the aforementioned deal. As you approach the quarrel, you will pass Pacer hiding out in a bus stop while the NCR is unloading on him. You must carefully approach the NCR without holding a weapon (or else they will turn on you -- then you must fight them and become vilified amongst the remainder of the NCR) and allow the deal to be considered. Return, then, to The King and reap the reward.