Not sure if this fits @HWT's terms, but this contains sudden transitions at 2.00 and especially at 5:05. Almost two or three songs in the one track. Love it.
Struggled to fulfill the butterfly aspect so decided to go massive on the caterpillar. Metallica performing a quaint little cover of the Anti Nowhere Leagues ' So What '. Genuinely uplifting lyrics and even mentions my home town of Eastbourne!
The transition here is at 3.40. A wistful indy catterpillar turns into the song, the butterfly, later re-recorded that announcd the wonderful Mr Burns as the voice of early 80s disco, FFS.