Квітка мого життя / На Маямі
Completely unknown history. These songs are also frequently sung separately, so it's unclear if they were originally 2 songs which somebody later mashed together or if they started combined and were later split. The former seems more likely, especially considering how the vast majority of sources include only the "На Маямі" portion.
We are choosing to keep them combined mainly to preserve the "А-а-а" portion of the chords and lyrics. If it weren't for the transition, they would likely be split.