Answer: b) c) f)
a) and e) are incorrect because pianos and pianolas are mentioned in the context of life before recorded music.
d) is incorrect because this is mentioned as something that changed the sound of the orchestra.
b) is correct because the speaker says: New technologies …. can alter the sound of music and, in the case of electronic recording systems, affect the economics and distributions of music.
c) and f) are correct because the speaker says: … with the Internee, sites to download music from, file-sharing, and so on, we have access to more music than ever before – and a lot of it for free.