Delta Heavy - Get By
I went through a dubstep phase in my life where I would search for new songs to pump myself up at work. In that search, I quickly realized that dubstep is skewed by an insanely high amount of terrible dubstep songs vs the rare good dubstep songs. This led me to "Get By" from the duo Delta Heavy.
It's hard to explain what makes a good dubstep song. With the sea of wubby bass drops from any kid with a laptop, Get By stands out as a complex and classic dubstep track that I always use to introduce people to dubstep (even over Skrillex). Also, the video is great.