One of my favorite songs of all time is Chaconne, a Bach piece, which was originally written for violin but thanks to Segovia, has a beautiful transcription for the classical guitar. I ran across this quote that pretty much sums up the piece.
"The Chaconne is the most wonderful, unfathomable pieces of music. On one stave, for a small instrument, the man writes a whole world of the deepest thoughts and most powerful feelings. If I imagined that I could have created, even conceived the piece, I am quite certain that the excess of excitement and earth shattering experience would have driven me out of my mind." Johannes Brahms