Given the following 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.",  answer the following question. Note that the answer is present within the text.  Question: If a popular songwriter is looking for inspiration, what is a source with proven success?
Answer:
classical music