Are societies becoming more self-centric? Evidence from five decades of popular music spanning three continents. - Golubickis, Marius; Jalalian, Parnian; Masroujah, Leoni S.; Selvaraj, Esther S.; Sharma, Yadvi; Seow, Siew Hwee; Borrego-Guerrero, Adriana; Marr, Sadie; Macrae, C. Neil (PLoS ONE, 2026)