Formal structure of  "Piggies":
Verse 1 0:05-0:21
Verse 2 0:26-0:43
Middle 8 0:48-1:06
Break (verse) 1:06-1:21
Verse 3 1:26-1:41
extended tag 1:41-1:53
Comments: Though everything else is pretty standard, the tag in "Piggies" is particularly interesting. This tag is brought back a total of five times throughout the two-minutes song, each time slightly varied, and with a different structural function. The first tag (0:00-0:05) is expository and, obviously, introductory. It prepares the verse that immediately follows. The second tag (0:21-0:26) is an iteration of the first with one tiny change in notes: The fourth note D-flat switches to an A-flat. The third tag, however, is quite different: It ends on a C7 instead of an E-flat the way the two previous tags had. This propels the music into the next structural section, the middle 8. The fourth tag (1:21-1:26), like the second, is nearly identical to the first, both in notes and function. Finally, the fifth tag starts similarly to all of the others, but is extended (four measures instead of two) through the use of mode mixture before concluding the first coda by cadencing on the dominant (E-flat).
"Piggies" also uses two codas, something the Beatles had done previously in  "Hello Goodbye", and  "Don't Pass Me By".
This blog is a workshop for developing my analyses of The Beatles' music.