The first sentence of your paraphrase isn't grammatical and I don't really understand what you're trying to say. The rest of it roughly corresponds to the original, but isn't always an exact match in meaning.
For our songs, you just try and get out of the way -- means that you try not to be too obtrusive in your musical contributions to the song. It's not very clear whether "you" really means "I" (i.e. the speaker) or refers generally to all the musicians creating the song.
try and figure out the thing that you can do that is going to support the melody and make the song sound as unadulterated as possible -- "Unadulterated" here means something like "pure and simple". Is there some other part you're unsure about?
Simplicity is what it is, for me. -- simplicity is very important for me; it's the key to creating the music.