Original sentence: The textbook American Popular Music defines pop rock as an "upbeat variety of rock music represented by artists such as The Beatles,Madonna, Elton John, Paul McCartney, The Everly Brothers, Wings (Paul McCartney and Wings), Rod Stewart, Chicago, and Peter Frampton
Edited sentence: The textbook American Popular Music defines pop rock as an "upbeat variety of rock music represented by artists such as The Beatles, Elton John, Paul McCartney, The Everly Brothers, Wings (Paul McCartney and Wings), Rod Stewart, Chicago, and Peter Frampton