The problem with positive thinking by Seth Godin offers some ideas why negative thinking is so prevalent, but he still asserts that positive thinking is the way to go.
Taking Liberties: Reviving the art of classical improvisation by Alex Ross of the New Yorker gives some history on improvisation in classical music, but it his discussion of cadenzas that is most interesting, especially for singers.
Music Teachers – Must Have Downloadable Freebies For the New School Year by Dr. Joseph Pisano of MusTech.Net gives an amazing list of free software options for music teachers and musicians in general.
Dealing with Rejection from Once More with Feeling is a timely piece since another season of auditions is upon us all. It offers something of a pep talk and a mental reframing to help us survive the pain that invariable comes from rejection.