You can custom theme with different BGM (just remplace BGM.at9 ) : http://mangueah.free.fr/NanKa/psvita/life-is-strange/lis.html
It's possible install all theme (just rename folder) : PCSF00688-CUSTOM0001LIS , PCSF00688-CUSTOM0002LIS, PCSF00688-CUSTOMXXXXLIS...