Topic: Capitalization: "Come on Eileen" or "Come On Eileen"?
Regarding the song by Dexys Midnight Runners, should it be "Come on Eileen" or "Come On Eileen"? Normally "on" should be lowercase, but in this case the phrase "come on" is a two-word phrase meaning "please". "On" is part of that phrase, not a preposition indicating that anything is "on Eileen", so I would vote for capitalizing it: "Come On Eileen".
I refer to the rationale for the exception to (2c) on the Capitalization Standard for English, specifically the examples of "Logged In Eternally", "Plug In Baby", "Turn On Tune In" and "Dream On Dreamer" given there.
A similar argument could be made to capitalize the a-ha song as "Take On Me" instead of "Take on Me".