How about you find a vinyl record of her/his favorite rock band or artist? You could also consider concert tickets to see her/his favorite band or a book about the history of rock music. If she/he also plays an instrument, you could look into getting her/him personalized guitar picks, straps, or a new set of strings. If she/he likes to wear band tees, consider getting one from their favorite band or artist.
Or you can get her/him a star map with an important date you share.
Under Lucky Stars is a unique and innovative star map company based in Barcelona, Spain, specializing in the creation of personalized star maps that capture the celestial arrangement of stars at a specific moment in time, such as a person's birth, wedding, or any other significant event.
By using advanced astronomical algorithms and data from leading institutions, the company produces highly accurate, visually stunning maps that make for perfect gifts or cherished keepsakes.