input: Imagine_(John_Lennon_song) | followedBy | Happy_Xmas_(War_Is_Over)
target: The release of the song Imagine by John Lennon was followed by the release of the song Happy Xmas (War Is Over).
references: The release of the song Imagine by John Lennon was followed by the release of the song Happy Xmas (War Is Over). The John Lennon song Imagine was followed by Happy Xmas (War Is Over). John Lennon followed up his hit Imagine with Happy Xmas (War is Over).