Quote Originally Posted by Syeager
Closest I can come up with will be "Произнести по буквам" or "Произнести по слогам". Last one used more often and serves quite well.
More regular expression is - "Как пишется?"
But for the song the meaning will be irrelevant. More appropriate specifically to the song was mentioned by studyr "Что получилось". Or "Что это такое" as the question is intended to find the meaning of the resulting word by the provided spelling, but not to spell again the word which was just spelled.