Do you know, Mallet Magic, Audio Fidelity, 1956?
This album was the fore runner of the Hi Fi demo discs used to show off the best equipment of the day. I first heard it through a JBL Hartsfield and Electro Voice Patrician, in the same room. Audio Engineers , Milw, Wisc. 1958.
I cleaned that same LP I bought back then, and heard the sound I remembered as one of the best demo records I've ever heard. The cleaning process was the Key.