Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A true American classic.

Rarely does an album come along that is completely perfect in every way. In 1971 an album was released that is truly flawless, Led Zeppelin 4. Everything about this album is perfect. The art is so stunningly cool. As cool as the art is, the music is what really matters. "Black Dog" is a classic. "Rock N Roll" is amazing. "Battle" is an amazing epic. "Stairway" is a beautiful, but very overplayed song. "MMH" is a great song. "Four Sticks" is an amazing song as well. "Going to California" is so much more beautiful than "Stairway". The best song is saved for last however, "When the Levee Breaks" is Zeppelin's best take on the blues. Overall, this is the best album, musically, ever made by anyone.