Haha, I didn´t exspect that!
Hm, if one of your cousins is from Hamburg, that means they are more likely acustomed with the "nothern" part of Germany, that is very much like more nordic countries, Denmark, sweden etc.
They produce some very good music, not as densly populated as the rest of germany, so the people tend to be more what we call "lone wolfes".
There is also a lot of very friendly and tight knit community in the rural areas. By the very rough and unforgiving sea the people tend to be the same, rough around the edges, "wortkarg" not saying much, but also very wholesome and steady.
Whereeas where I grew up, the south, especially Bavaria - might be the image you´ve most widely seen when Germans are depicted in mainstream media. The Dirndl and Lederhosen, the Oktoberfest and all of those popularized images are Bavarian.
The people there are different. They are very open and almost boasting, proud and loud. They are like the mountains you can always see in the distance there, big and towering, impressive individuals.
What connects them as Germans is probably a straightforward nature, when needed to be.
The music is very different in all its individual parts. You have to keep in mind that a lot of what is on the radio is the same english speaking sounds that you might hear - at least 70%.
Here is a mix of storytelling and music, bavarian, that I love a lot. It´s about the fear and the love for a mountain.
Germany has a complicated relationshp with art. It used to pioneer in some of it, but recently, the production has gone into a strange, empty era.
All of what I said are of course just very generalised impressions of what I have gathered over the years 
Definitely come visit sometime!
Oh, I might also mention: with the recent taking in of almost a million refugees, Germany is becoming a lot more diversitised than it ever was - which, with all of its struggles, i find really, really beautiful!
