Getting thrown in at the deep end when I moved to NYC to do session work, turn up for piano parts on a french rock and roll vanity record (rich backers and limited talent artist!) and Steve Gadd, Eric Gale, Gordon Edwards and Richard Tee, in other words, most of Stuff were the rhythm section! That will tighten your sphincter!
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An arranger is just a tool. What matters is what you build with it..!