@@jasontheintrovert8756 you just have to keep playin the game. You get currency through fighting. You'll also get notified when you unlock a music theme. The easiest way i know of is to get currency is in Quest mode and tryin to beat every single mission. Idk if to unlock the theme is tied to the character you choose but i do got this Tina theme in DOA 6 and i did play with her for hours.
SF6 Tina if she is a guest character Hailing from Texas, Tina Armstrong would be a well known wrestler due to her father Bass. After getting tired of the DOA tournaments, Tina decided to go off and return to the wrestling scene. One of her return matches would take place in Metro City, which was a new place for her. Reminding her of NY, Tina was wowed by all of the city streets and bright lights. Entering her match, it would be against Rainbow Mika, well known in the wrestling world along in the Street Fighting world. Tina defeated Rainbow Mika, shocking the whole crowd and leaving them in pure silence. Heading back to her locker room, Tina would overhear about the SF6 tournament coming up due to announcement made by the ringside area. Tina immediately ran back out and signed up to try her chances at Street Fighting. Outfit For Tina Could be a mix of Blue Mary from King Of Fighters and Shina from Bloody Roar.