Please answer the following question: I want to test the ability of students to read a passage and answer questions about it. Could you please come up with a good question for the passage "Numerous examples show influence in the opposite direction, including popular songs based on classical music, the use to which Pachelbel's Canon has been put since the 1970s, and the musical crossover phenomenon, where classical musicians have achieved success in the popular music arena. In heavy metal, a number of lead guitarists (playing electric guitar) modeled their playing styles on Baroque or Classical era instrumental music, including Ritchie Blackmore and Randy Rhoads."?
A:
What period besides Classical influenced popular musicians?