On 'Metallica,' I recorded six or seven different guitar solos for almost every song, took the best aspects of each solo, mapped out a master solo and made a composite. Then I learned how to play the composite solo, tightened it up and replayed it for the final version.
Because of things like iTunes and streaming and social networking, it's destroyed music. It's destroyed the motivation to go out there and really make the best record possible. It's a shame.