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Practice will help you play piano better - but it's not going to turn you into Liberace. A new study looks at the role that working memory capacity plays in piano players' ability to sight read a new piece of music, an important and complex skill for musicians. Scientists have debated the role of practice in developing expertise for over a century...
http://www.k2pedia.com/psychology/55354-musical-skill-reflects-working-memory-capacity-in-addition-to-practice-time