Classical music is a form that has found its roots in tradition. Symphony, concerto, sonata from the West and Hindustani and Carnatic music from the East are a few examples of classical music. The major differentiating factor between classical and popular or folk music is the use of written musical notation to create a score. Singers who pursue classical music are called vocalists; every vocalist can be a singer but every singer can't be a vocalist. Singer is a term used to refer to playback artists or people who dabble with popular or folk music. Johann Sebastian Bach, Billy Joel, Igor Stravinsky, Franz Schubert, Tansen, Beghum Akhtar, Ananda Shankar, Bhimsen Joshi, Ghulam Ali Khan, Girija Devi, Pandit Jasraj and Tyagaraja are some eminent vocalists. Read these quotes by some of the world renowned vocalists to develop a better understanding of classical music.