"So, I turned around and said to the two ladies behind me: "What do you think of the music?" Answer: "Great......wonderful." And these ladies grew up in the 50's!"
I think that what often happens when people are listening to artists of 'their era' sing their songs, the audience is still hearing the ORIGINAL recording in their mind ... what is actually happening on stage doesn't matter ...
Not too long ago I saw a you-tube clip of a group that had a BIG hit in the late 50's ... they were appearing at one of the 'oldies' shows ... I knew something didn't sound right and then I realized that the lead singer (who I think was the only remaining member of the original group still performing) was singing the song an octave lower than the original ... I doubt very much if anyone in the audience realized it ...
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t.