I’m glad you brought up this topic Donny,  I’ve been meaning to start discussion on how specialized  musicians seem to be coming. I have several thoughts on this topic, but what I’ll say now is, I really admire someone, especially a whole band that takes the time and effort to learn the exact parts from original recordings and be able play them back on their instruments perfectly and sound just like the ““record”. 
That being said, I personally would much rather hear a musician’s unique rendition , interpretation, arrangement or a new twist on an old classic. I’m sure I’m in the minority on this, probably the general public wants to hear a rendition of a familiar song as close to the recording as possible? 
 
Paul, this is the exact reason I say that when we had the band in NY - late 50's to early 80's was the best time for bands because we did not have to 'copy' anyone ... Played the tunes so people would recognize them, but in 'our' style ...