[quote name='Drax' timestamp='1419271698' post='2638220']
Even published tab books are only created by someone sat down trying their best to decipher what is played, there's no more science than that most of the time.
[/quote]
And the books can be as bad as some online tabs...bits missing, wrong key etc etc. The big publishers are quite bad for it. Stuart Clayton and his Bassline Publishing books are bang on though, others can be very poor in comparison.