Simplify the following text for a Grade 9 native English-speaking person.
Original: Christopher Scott Thile ( ; born February 20 , 1981 ) is an American musician , best known as the mandolinist and a vocalist for the progressive acoustic trio Nickel Creek .
Simplified: Chris Thile ( born February 20 , 1981 ) is an American musician , best known as a member of acoustic band Nickel Creek .