The term 'Musical Series Set at McKinley High' refers to the popular television show GLEE. GLEE is an American musical comedy-drama television series that aired on Fox from 2009 to 2015. It follows a high school GLEE club called New Directions, set in the fictional William McKinley High School in Lima, Ohio. The show features a wide range of musical styles, including pop, R&B, soul, and rock. GLEE was a critical and commercial success, winning numerous awards and earning nominations for many more.