Almost the same intro music

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There are songs that have almost the same intro music. I have heard a lot of them before but I forgot most of them. I can think of only one pair as of the moment (which means two songs) - "Drowning" by Backstreet Boys and "All or Nothing" by O'Town. I used to be confused by these two songs when it was popular back then. But now, I only hear these on my music player. :( Can you think of other songs that have almost the same intro music. Help me out here guys please!