In Bill and Ted Face the Music the modern-day versions of the characters are finally forced to write the song that is supposed to unite all of time and space, but since the two have had no success writing the song previously, they decide the only way to do it is to use time travel to go forward in time to a point after they have written the song, and get it from their older selves. This plan is, probably unsurprisingly, not as simple or successful as Bill and Ted expect it to be.
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