Every Led Zeppelin fan has their own favorite album so mine is the third one because it's so uneven and weird.  I also like the softer acoustical stuff that the album is largely made up of.  Today's Vault pick is actually two tracks that run together, Friends and Celebration Day.  With all their moodiness and minor chords, they may fall under the "weird" category mentioned, let me know what you think.  5:20pm on the radio or on-line.