@DaniHopkins I am not familiar enough with Yandere Simulator to know what you need specifically but, you may want to check out these sites:
http://simsnoodles.blogspot.co.id/search/label/hair?max-results=12 *site plays music
https://cas-fulleditmode.tumblr.com/tagged/s4cc They have several downloads peppered throughout their CC section.
http://houseofabsurdities.tumblr.com/mycc
https://notanotheranimesimblr.tumblr.com/search/yandere
http://studio-k-creation.tumblr.com/search/yandere
http://studio-k-creation.tumblr.com/search/school+shoes
https://sizeablemovie-sims.tumblr.com/post/156412482157/sims-4-yandere-simulator
http://sssvitlans.tumblr.com/tagged/s4Yandere%20Simulator