How about a customized vinyl record of their favorite musical movie soundtrack? Alternatively, you can gift them a subscription to a musical theatre production streaming service, or a personalized playlist of their favorite musical songs. If you want to go the sentimental route, you could also put together a scrapbook of their favorite musical movies with tickets or other memorabilia from each one.
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.