This is one of my earliest pieces. There was a period in the late 90's and early aughts when this design for CD storage become very popular. You know, back when CDs were popular. Being a fan of libraries, this card catalog-inspired design appealed to me, so I built my own.
My CD collection outgrew this cabinet, of course, and now everything is on The iTunes or The Spotify. But I'm old fashioned just enough to keep this piece, and my physical media, around.