The Methods & Tools newsletter has released in its archive section the
article "Exploratory Testing: Finding the Music of Software
Investigation". Through experience and a lot of trial and error,
testers and musicians have developed skills they can't easily explain.
Unfortunately, with software testing, there aren't as many obvious
avenues for skill development as there are for musicians. Many software
testers don't realize that there are learnable exploratory testing
skills they can develop to help them become even more valuable to
software development teams.

http://www.methodsandtools.com/archive/archive.php?id=65