grammar - 'in between' or 'between'

I have the following sentences.

1. What is the name of the song in between 0:00 and 0:21 minutes?


2. What is the name of the song between 0:00 and 0:21 minutes?

I am not sure, which sentence is correct?

Thanks!

Answer

Between is a preposition, while in between acts as an adverbial (from a fellow website answer)

preposition: I found myself caught between a rock and a hard place.

adverb: There was a rock and a hard place, and there I was lying in between.