if you are finding about a new band that you are starting to really like, such as pink floyd, leave out one of their albums, and never listen to it or even buy it. just know that you have never heard it. Then if the band becomes your favorite and you have listened to all their material many times, you can go back to this album, and it will (hopefully) completely new material.
I chose A Saucerful Of Secrets by Pink Floyd. It was their second album, and the last with Syd Barrett, and i have only heard an alternate version of one of the songs on it. So far I really like it, i'm glad i saved listening to this album, and plan to do this if i find another band with a wide discography that makes this possible. I regret not doing this with beck, although i am not very much into his later, more hip-hop influenced music, for some reason.