One of the best songs Led Zeppelin ever recorded. This was originally a Yardbirds’ song. Page took it with him when he formed Led Zeppelin. Listen to the conversation between the bass and drums in the interlude when Page is doing his solo using the cello bow. Jones plays five notes on the bass and Bonham replies with five beats on his snare. That occurs other times in the song with five chords on the guitar followed by five beats on the drums.
I loved the early Led Zeppelin best when they were more of a blues rock band. This song and the Lemon Song are my two favorite Led Zeppelin songs.