I would like to preface this post by saying that I am a musician. Have been studying the world of music seriously for the past ten years both as a Guitarist and Producer. I also have an intense interest in the musicology field and have been studying that particular facet for the past 2 years of my post-secondary education. I am not stating this to somehow boost my statements into some sort of intellectual superiority, but I felt it necessary before someone took me to task on the source of the following opinions.
In Rap music the ideal creator is not an instrumentalist, but rather a skilled producer. To take and sample pre-made beats to produce multifaceted and original compositions takes years of learning and experience. You don't just stick a mic up to the speaker grille hit record and hope you get luck. An advanced DJ/Producer must have an ear and mind for what makes quality music. Furthermore, please do not assume that because some one plays an instrument, their ideas are completely original and that their art is now elevated beyond a DJ.
Now, granted the music we hear on the radio is soulless garbage, but this applies to all genres that are presented in the top 40 fm format from Pop to Alternative. If a person took the time to look outside of the mainstream they would be rewarded with well thought out music that speaks to whatever they are looking for.
To the subject at hand, I also enjoy Industrial (Skinny Puppy, :wumpscut:, Front Line Assembly) and Metal (Suffocation, Ephel Duath, the Crown, Frantic Bleep).