My voice is my improvisational instrument, the melody instrument. The guitar is harmonic structure. I'm not a good enough guitarist to improvise on it.
Not every song I write is ecstasy. And it can happen only one time. After that, when you sing the same melody and words, it's pleasure, but you don't get wiped out.
One of the things that upset me was some of the criticism leveled at Simon and Garfunkel. I always took exception to it, but actually I agree with a lot of it.