Just my personal opinion....the CD's and records I buy, I expect to be technically correct, both musically and in the words,(partly because I use them to learn the guitar stlye and verses). I love going to live "folk"/bluegrass concerts and expect that at some point during the performance, a mistake will be made by the performers. To me , the creativity of a performer/s covering mistakes, making up forgotten words, losing the finger picking pattern, fixing broken strings, retuning (within reason), etc.,etc. is what makes a live concert fun...and makes the performer HUMAN just like me. The least fun for me is attending a concert in which everything is technically correct! I'd much prefer to listen to my stereo. I guess also, the difference to me is that, in dealing with the mistakes made in a band, an audience member can feel if the band is playing for the love of the music, or as a scientific study.