More than some, less than others, I suppose?
There are times when I get a copy of something from someone that's not a complete score. Maybe its a roughed out lead sheet, maybe its a poor quality sheet music, etc. It gives me the chance to give it a test run and see if its something I want to take to the next level. Often I'll then buy the music from one of the online merchants for my working copy.
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Bill in Dayton