Music publishers are stepping up their campaign to remove guitar tablature from the Net.
Recently Guitartabs.com received a legal letter from lawyers for the National Music Publishers Association and The Music Publishers Association of America.
Here is a copy of that letter - http://www.guitartabs.com/nmpa.php
These organizations are interpreting the definition of their intellectual property to include done-by-ear transcriptions of music. Guitartabs.com is currently not offering tablature while the owner evaluates his legal options.