Without the bottom you've nothing to stand-on (so to speak). Drums are often the literal heartbeat of your music. Relaxed (OK, yes that can mean "poor") timing and weak sounds will rip the soul right out of your songs. I can edit your drum parts to tighten timing without making it sound robotic and replace or layer parts to enhance the sound and punch without having to eq-in lots of mix-wrecking mud!
Mixing is the last truly creative part of the production of music after writing and arranging. High-end-celebrity Mixing Engineers are treated (and often paid) like gods. So why is your mix often treated as a necessary evil to be stuck on the end of a recording session by the same guy who hates you because he just spent an 8 hour day listening to the guitar player trying to play a funk "Stairway"?!?
What most people think of as Mastering is really Pre-Mastering - it's the last step of the production of content before you get into production of media. As such it is the last opportunity to check your mixes and to add the final polish.
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