My father used to collect music cabinets that were used during the 1930s. They were (and still are for people lucky enough to have them) the ideal way of storing oversized pieces of music (and even normally sized pieces of music). If you had a piano in the 1930s, you probably also had a music cabinet. My father's reason for collecting them was utterly practical: to store music. He also knew that when they stopped making music cabinets like this one, such things would never be made again.
I came across an interesting blog post this morning about the rise of the electric refrigerator during the 1930s, and noticed that the refrigerator in this ad could be purchased from the San Antonio Music Company. Look at the design! The model for the first electric refrigerators seems to have been the music cabinet, and music stores (or at least this one in San Antonio) were getting in on the action.