Got to agree with squeak, here, Bill... If you think that current arrangers ARE 'keeping up with the times', sadly I have to inform you that it is YOU who aren't!

There isn't a single style in any TOTL arranger in the hiphop and rap genres that sounds remotely like anything contemporary. Three or four or five years ago? Maybe, but in hiphop, that's a lifetime!
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An arranger is just a tool. What matters is what you build with it..!