Rewinding to Bobert......

It's all about being an entertainer... Everything else is just details... Singing included... .

Can we identify two different reasons why someone might be on a pro / semi pro stage. One is as a 'musician', but "playing" a 'voice' rather than a violin or sax. You are reproducing someone elses work as near as possible to how it was intended. You're simply the mode by which that audience is receiving that work.

In this case you'd be expected to be accompished within the context of the musical genre, as the cellist in the orchestra.

If you're singing as an entertainer then Bobert's comments apply.

In the folk world we are 90% entertainers I would suggest - thank goodness! (and its the notional 10% I personally find boring).

Ian F