Do you think LP needs break-in to sound its best?

Mold release is applied to album stampers to prevent the vinyl from sticking to the stamper. Some of the mold release will be transferred to the new album; therefore, new albums should be cleaned prior to play. What you are hearing is the phono cartridge needle cleaning the mold release from the grooves of the album after each subsequent play.

the record will become M- after it played the first time.

I do clean all new LPs I buy before playing. I am with Elizabeth that the first time listening the sound is just all right. It just sounds better after several plays.

Brf's explanation also makes senses. I don't have the same experience with CD though.

You guys/gals might be right although not sure I have heard a difference. My wife bought me a couple of Stones remasters, beggars banquet and exile and I was supremely disappointed - prefer my pressings from the 70's. The guy who sold them said the vinyl needs to burn in and I thought she was taken advantage of and it was a crock of sh$#t. I have not listened to them a second time - maybe I will give them a chance.