Which song was the Beatles' first big American hit?

Which of the following was an important technological factor in the spread and development of jazz in the 1920s

a. Exposure on Television b. Radio became a mass medium c. Music was stored on piano rolls d. Phonograph recording was invented

Which part of a stringed instrument is used to make the strings vibrate?

a. the bow b. the bridge c. the fingerboard d. the tailpiece