I've been in a few hired horn sections myself. Usually going to a recording studio after the rhythm track and either a temporary vocal or the final vocal track is finished.

Stick a chart in front of us, tune up, do some volume tests and go. It doesn't pay well in this area, but it's an easy few bucks for an hour's work.

When we were being courted by Motown, many, many years ago, the horn and string players that did the sessions were often from the Detroit Symphony.

And I agree with Jim Fogle, the horns are an essential part of the song, and even the slight intentional or unintentional intonation discrepancies add to the part.

I say intentional because sometimes when playing a part, I'll play it a little sharp if my line is on top to add just a little edge to the ensemble.

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