Holly sang along as the band played her favorite song what kind of sentence is this?

This type of sentence is a rhyme. Rhymes are correspondence of sound between words or the endings of words, especially when these are used at the ends of lines of poetry. This sentence is a rhyme, since along and song correspond in sound.

Here's an example of an rhyme:
• I heard a small DING and they pulled out the pan.
Finally, I thought, I'M A GINGERBREAD MAN!