Good question :-)
During the Agate time period (1st sem), the whole year was in one hostel with wingmates from around the country. There was significant cross-cultural interchange.
'kaNNE kalaimAnE' was a huge fav and NI students sang / played on guitar etc.
However, from the next sem, there was choice of hostels (one of the two) and also choice of wingmates. From 4th sem, in the single room stuff, each wing had 21 rooms (6 wings per hostel) and the closer friendships were mostly limited to your wing / floor mates and people tend to flock based on their background / identities etc.
That limited the cross-cultural connection to a great extent and I had limited opportunities to strike lasting friendships with Hindi-speaking boys :-( Except some "common-room-carrom-cricket" connections. So, didn't have much interactions with them.
Generally speaking, however, during music / entertainment programs, festember etc, all the popular hits of rAsA were enjoyed by students from all states :-)