I've always considered transcribing to be an invaluable tool in the development of one's musical ear and, over the years, I have spent countless glorious hours transcribing different kinds of music, either guitar-oriented or not.
Steve VaiThe blues scale was the first thing I learned. It's just a pentatonic scale with a flat seventh and a few notes that sound cool when you bend them. And because people have amalgamated the blues into this rock-blues scale, if you're using it, you better sound like a real authentic blues player.
Steve Vai