How about getting them a personalized music sheet of their favorite song played during their wedding? You could also consider getting them a set of high-quality instrument accessories, such as new guitar strings or a new set of drumsticks, depending on the instrument they play. Alternatively, a premium membership to a popular music streaming service that allows them to listen to their favorite tunes without interruption would also make a great gift.
Or you can get her/him a star map with the date of the wedding.
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.