From an interview with Alexander Balanescu:
There is a story about Rostropovich, the famous cellist, from when he visited India. There he saw street musicians who played a traditional Indian stringed instrument - a single string playing a single tone.
Rostropovich found this a very interesting instrument, so he began to talk to the musicians, and asked one of them
"But why play only one note? I play a lot of notes - four strings, and play two or even three notes at once.
The man replied
"You know, I have found my voice - you're still looking for yours".
- Translated from the Hungarian original at http://quart.hu/cikk.php?id=2875
"Louder! Louder! I can still hear the singers!"
- Richard Strauss to the orchestra, at a rehearsal.