IPA: /ˌɛkstrəˈmjuːzɪkəl/
KK: /ˌɛkstrəˈmjuːzɪkəl/
Relating to things that are outside of music or not part of music itself.
The extramusical elements in the performance added depth to the overall experience.
Extramusical → It is formed from "extra-" (meaning outside) and "musical" (from Latin "musicalis", meaning related to music). The word "extramusical" refers to something that is outside the realm of music or not related to music.
Think of 'extra-' meaning 'outside' and 'musical' relating to music — so extramusical refers to things that are outside the world of music.
No commonly confused words.