C
1. He said that you should usually turn off the phone and keep it silent mode.
2. It rang during the final and most moving bars of Mahler's Ninth symphony.
3. It is a measured contemplation on death that ultimately falls silent.
4. This orchestra was conducted during the final years of Mahler's life.

P
1. The conductor of New York Philharmonic orchestra got angry when a
mobile phone went off during a performance. He stopped the orchestra from playing.
2. Blogger Michael Jo reported that Mahler's Ninth symphony was unexpectedly interrupted during the final and most moving part.
3. During an almost brand-new playing, Mr. Gilbert impatiently halted the orchestra; something that has rarely been done before.

S
The New York Philharmonic conductor stopped the orchestra's performance after ringing a mobile phone rang during the show. The phone had been ringing for several minutes during the performance, so the conductor was obliged to cut the orchestra and waited untill the phone was turned off. After the phone was switched off the phone, the performance was started again.

C
1. The grammar of your answer is fine, but it is not correct. The conductor said that usually you should ignore interruptions like that: "Usually, when there's a disturbance like this, it is best to ignore it, because addressing it is sometimes worse than the disturbance itself."
2. Good.
3. The music is about death, and it ends in silence. It is not about falling silent.
4. Mahler is dead, so you have to talk about him in the past tense. Anyway, you got the answer right.

P
1. Great paraphrase! The only thing is that he was not playing himself. The conductor is the guy who leads the orchestra, but he doesn't play the music.
2. Perfect!
3. "Unprecedented" means that it has not happened before, which I think you understood, but it means the stopping of the orchestra, not the playing of the music.

S
1. "Ringing a mobile phone" sounds like he stopped the performance so he could make a call.
2. The conductor said that they would start the symphony again.
3. If you use a passive (was switched off), then the phone is the subject of the sentence. Be careful with this grammar point.