Allright, i want thank all of you for your suggestions.
I won over the rock/metal fans with: Dressed to kill, the Relic, Dragon's Den, Evolution, inferno and the eyes of medusa, of sins and shadows
The classical dude was won over with: the edge of forever, a fools paradise, the Odyssey, (and I lured him into the Accolade with the great violin opening)
The dreamtheater guy with everything that lasts longer than 12 minutes
particularly with the divine wings of tragedy (the song), the The Odyssey and the death of balance
My general impression is that people are used to "drive in music" if you know what I mean. Songs that last 3 minutes, repeating the catchy chorus 5 times and that's it. So the trick is to make 'm listen to parts of songs that are easy and catch on fast and then gradually submit them to more long lasting, true sx fury. In short, you want to make 'em go
:hotjump: but you don't want to make 'em