Sound of silence started me on Simon and Garfunkel.
Ever since then I have been following their songs and always, always taking care always to follow the lyrics. This is often difficult because of sound quality and also because of the accent.:)
Keeping in mind this difficulty, I have always kept the version with the lyrics."Kathy's song" is something I just came across and the lyrics too are available here. Heartbreak it seems is often the best muse for poetry , the world over :)