To be honest you would need a lorry to carry a collection big enough to cater for every request that you get when D.Jing. IMO a D.J should be allowed to play a set without people coming up and pestering for requests, a good D.J should carry something to everyone, and punters should be open minded enough to accept this. If I ever get pestered while D.J'ing I just say sorry don't play requests, and I hope you enjoy my spot, maybe the next D.j will play a request for you, I certainly wouldn't get into a debate over it.