I'm not a fan of Hip Hop music, not for the life of me! But I did listen to some Italian hip hop songs before coming to Italy, and then during my first months here, while I was still trying to learn the language. So, in other words, I listened to these songs for educational purposes
They were the only Italian songs I was familiar with so they stuck in my head and actually, I've grown attached to some of them.
For instance, i used to listen to a lot of J-AX. It's not really heavy hip hop, but it's quite nice to listen to, especially if you get to understand the lyrics
Here's one of their quite famous songs: Ti amo o ti amazzo
Then, everyone must already know by heart this next song:
It used to be so popular! It's Fabri Fibra with Gianna Nannini, singing "In Italia".
The Italian Hip Hop culture exists,it really does, but they're indeed not that popular abroad. They have great success in the country though.