In the song Amie by Pure Prairie League there is a repeated section of muisc that is about 4 bars long(or 2 depending on how you count it). It occurs between every section of music except near the end with it is left out(I assume to keep the momentum going and because it is not as crucial).
It occurs right before the verse(or the first 4 bars of the verse before the lyrics come in).
About the best thing I can think to call it seems to be a pre-verse but this does not feel quite right. I know most will probably want to lump it in with the verse but this doesn't feel quite right either(to general).