This is more difficult than what it seems---as the replies suggest! As Bri Philips mentions if this was done in the early 70's then dead easy almost all classics and more importantly when these newbies went out to get their first fix of northern they would be guaranteed to hear them. Then they could move on eventually to whatever floats their boat.
How about a bit of reverse psychology here. Give em a cd with current niter big hitters, Butch c/ups, Soul Sam obscurities,rarities etc etc. Then when they do go out , imagine the joy on their faces when they hear something 'new to them. For example they've heard the current 'upfront' stuff then somewhere someone puts on williams and watson---too late Wow that would blow there socks off like it did first time round for others. Then the next week they went out and heard say A little togetherness and perhaps johhny Sayles.
And so on and so on. This way much joy every time they went out cos they can't be shielded from oldies forever and they would be rushing around at do's saying 'WTF this? Startled soulies explaining to them its only epitome of sound etc etc
So really its getting in to the Northern scene now and then working backwards
It might work..................................................