The rules in Amsterdam have been different every time I've been there. Most of the rest of Holland is usually pretty open, but it has been a long time - over fifteen years - since I last made decent money there. Germany varies from town to town, but one which is not worth going to any more is München. You can only do it legally for half a day a week there and it is too far from a high paying town to make it worth the detour. Every Swiss town has different regulations. You normally need to go the the cop shop first. Zürich is right out. It is strictly forbidden and when they nick you they hang you. (If you look poor they hang you twice. The Swiss don't like poverty). Apart from Vienna and Vorarlberg (east Austria), it's pretty open in that wonderful land. There are also some very good festivals for buskers there.In Denmark all street busking is officially banned, although you may get away with it in some places. Sweden can be wonderful. Never ever look poor in Italy, Spain or Portugal. Two of those countries have had Fascist governments within living memory and not all of the old policemen have retired yet!PM me if you want to hear more about busking central Europe. Good luck.