I live in Nurnberg, a fabulous city with lots of music, big wide
shopping streets with buskers from all over Europe. I asked a council
friend of mine about the rules, they issue five permits per week but
in the summer there is a waiting list.
You wont have any problems busking without a licence as long as you
dont cause problems for shop owners or office workers, but you must
move 100 metres every half hour, this also applies to official buskers.
The Irish Pubs I know are basically drinking factories with ear
shattering background music, if they have live music it is basically
of the human juke box variety.
I think you would be better off in smaller towns where busking is
more of a novelty, if your in Nurnberg you could contact me if you
like on my homepage