The main point that people miss when saying that dubstep(or other subgenres of electronic for that matter) is that to make it, an artist still needs to know chords, melodies, harmonies, progressions, etc. If you listen to a lot of electronic out there, you can hear how it's been adapted from other music genres or instruments. You can hear where a synth progression has been adapted from a piano or a guitar. How many people know that Skrillex (bite me) was the front runner of From First to Last? He played lead guitar and knows how to play bass and I'm sure the piano as well. Deadmau5 knows how to play guitar as well.
To add to it, artists need to know how to use their computers to make music. The software they use isn't easy to use.
BTW, did I mention that Skrillex is 24 and From First to Last made it big when he was 16? Yeah, I can see a few people being just a little jealous at his success.
Lastly, my uncle is a composer. He graduated from Northwestern and teaches piano and violin at a prestigious school in Los Angeles. Many of his pieces have been used in movies and documentaries over the years. What does he use to write and record all of his music? A MIDI board hooked up to his macbook. No, my uncle doesn't need his MIDI board to make music, but he uses it as a tool because it's innovative and easy to use. He can do everything in house and save a lot of money by avoiding the recording studio and paying an orchestra to record his works.
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