Continuing the organic development we saw in verse 3, verse 5 retains the (d) harmonies while simultaneously introducing the new (e) melody.
4:20-4:45 (C) Verse 5 (9 measures)
4:20 (d & e) |C G |a |C G |a | “If there's a bustle...”
4:31 (d' & e) |C G |a |C G |a |C G | “There are two paths...”
Verse 6 is identical to verse 5, just with different lyrics.
5:08-5:35 (C) Verse 6 (9 measures)
5:08 (d & e) |C G |a |C G |a | “Your head...”
5:19 (d' & e) |C G |a |C G |a |C G | “Dear lady...”
Aaron Krerowicz, pop music scholar
An informal but highly analytic study of the music of Led Zeppelin.