Singing and being truthful to a song... I've developed that skill, and I know how to do that real instinctively, that's all I've been doing for the last 25 years.
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Trust your gut instinct over spreadsheets. There are too many variables in the real world that you simply can't put into a spreadsheet. Spreadsheets spit out results from your inexact assumptions and give you a false sense of security. In most cases, your heart and gut are still your best guide.

