If you want wall bookshelves that won’t dominate the room, then use wooden shelving units painted the same colour as the rest of the wall, allowing them to recede into the space. This way the colour of books pops, making them seem like objet d’art, in the same way the album covers become objects when displayed. For a cost-effective solution, if a fully bespoke version is beyond your budget, then even a cheap bookcase painted in the same hue as the rest of the room will still have a similar effect.