Meaning: 'When' refers to a specific time or period, indicating the moment his music was prevalent.

Wrong options:

• what: 'What' is an interrogative pronoun used to ask questions, which does not fit the context of providing a time reference.
• where: 'Where' indicates a place, not a time, making it irrelevant in this temporal context.
• whose: 'Whose' is a possessive pronoun, which does not relate to the timing of events.

Correct answer: blanketed

Explanation: The term 'blanketed' suggests that his influence covered or spread extensively across Europe, fitting well in the context of the sentence. It conveys a sense of widespread impact, aligning with the overall meaning.

Meaning: 'Blanketed' means to cover completely or to spread over an area, indicating that his influence was pervasive throughout Europe.

Wrong options:

• dented: 'Dented' implies a reduction or damage, which contradicts the idea of influence spreading positively.
• vanished: 'Vanished' suggests disappearance, which is contrary to the intended meaning of influence being present and strong.
• touted: 'Touted' means to promote or praise, which does not convey the sense of widespread coverage that 'blanketed' does.

Correct answer: performing

Explanation: The word 'performing' fits grammatically as it describes the action he was engaged in while on the road. It aligns contextually with overseeing productions, indicating active involvement in music.

Meaning: 'Performing' means to present music or a play to an audience, highlighting his active role as a musician.

Wrong options:

• collecting: 'Collecting' implies gathering items, which does not match the context of actively engaging in music.
• outperforming: 'Outperforming' suggests exceeding others in performance, which is not the intended meaning here.
• preparing: 'Preparing' indicates getting ready for something, which does not convey the active engagement in music performance.

Correct answer: arranged

Explanation: The word 'arranged' fits grammatically as it describes the action of organizing music for different instruments. It logically follows the context of studying and copying scores, indicating further adaptation of the music.

Meaning: 'Arranged' means to organize or adapt music for different instruments or settings, showing his creative involvement with Vivaldi's works.

Wrong options:

• repeated: 'Repeated' suggests doing something again, which does not fit the context of adapting music for performance.
• underscored: 'Underscored' means to emphasize, which does not relate to the act of modifying music for instruments.
• derived: 'Derived' implies obtaining from a source, which does not accurately describe the act of organizing music.