Roundabout

"Roundabout" is a 1972 single by the British progressive rock band Yes from their 1971 album Fragile. It was used as the ending theme for the first season of JoJo's Bizarre Adventure: The Animation.

Version 1 Ending Animation (Episode 1-9)
The ending depicts an Aztec mural depicting the history of the people that used the Stone Mask, beginning with the Aztec chieftain killing the woman and her spilt blood running through the mural, whilst images of the various characters in the series are also displayed. The mural also displays the eventual destruction of the vampirized Aztecs by the Sun, culminating in the blood reaching the Stone Mask, causing it to activate.

While the images alter dependent on the point in the arc uses, of particular note is the version from episode 1, which uses the initial 12-year old versions of Jonathan, Dio and Erina, despite being the only episode in this period and the actions from episode 2 onwards is the main story 8 years later.

Version 2 Ending Animation (Episode 10-25)
The second version of the ending is similar to the first, to an extent, though in this case it is an upward vertical scroll, along with a shadowed, background, showing that the viewer is trying to inspect the mural via flashlight. The animation begins with the Stone Mask breaking into pieces, before scrolling upward. The mural depicts the Pillar Men as well as images of tribesmen worshipping the power of the Stone Mask.

Like the previous ending animation, images of whatever characters appeared in the episode appear as well. For the first two episodes of Part 2, the image of Speedwagon would briefly show his younger, Part 1 era appearance, which quickly fades into his older appearance from Part 2. And despite being dead at this point in the story, Jonathan Joestar also appears in this version of the credits for the first two episodes of Part 2.

The animation ends on an image of the Red Stone of Aja placed upon a final part of the mural.

Trivia

 * Episode 3, 20, and 21 are the only episodes in Season 1 to not play the song in the credits.
 * Episode 17 plays the song while the credits appear, though it shows scenes of Joseph and Caesar training instead.
 * Episode 5, 8, 16 and 24 play the ending song at the 6:57 mark of the Full version.
 * Episode 14 plays a cut of roundabout, featuring the flamenco section of the song.
 * The artwork Araki drew for the cover of the Ultra Jump May 2011 Issue is a reference to the album art.
 * In the second version, when the Red Stone of Aja is displayed, several pieces of iconic paraphernalia relating to later JoJo protagonists can be seen i.e., a handsign symbol (Jotaro); vines (Old Joseph's Hermit Purple, circa Part 3); several arrows and diamonds (Josuke/Part 4), a ladybug-like stone (Giorno); a butterfly (Jolyne) and a horseshoe (Johnny).
 * "Roundabout" was chosen to fit with the time frame of Phantom Blood's comic publication and Araki's own musical preferences. It was one of the requested songs included on a memo Araki wrote for the staff. It's a song that the sound director, Yoshikazu Iwanami, liked during his own teens and he was happy to finally work with it. According to him, he was initially stumped on how to end episode 6 after the audio climax for Poco's scene and struggled to come up with a natural lead into the ending credits. Then Iwanami listened to the beginning notes of "Roundabout" and was dumbstruck at how well the pacing fit with the episode's cliffhanger without editing. He considers it a strange and happy coincidence.
 * The ending credits of each episode features the characters that were present in that episode, with exceptions from episodes that had the credits overlap the ending scenes.