meddle

after listening to "wish you were here" album i recommend you listen to "meddle" a more elevated album which includes the 20 min song "echoes" a masterpiece of blended sounds and highly studied guitar pieces. This album is one of the earliest work of Pink Floyd, works that do not include the powerful social message found in their later albums.
I recommend listening to this album with the light out and with a burning incense candle, you will have quite an experience.