The Baseballs

The Baseballs are a German rock and roll band founded in Berlin in 2007. They became popular with 50s and 60s style rock cover versions of modern hits such as "Umbrella" by Rihanna, "Crazy in Love" by Beyoncé Knowles, "Hot n Cold" by Katy Perry and "Call Me Maybe" by Carly Rae Jepsen. The band members are only credited by their nicknames (Sam, Digger and Basti). Their version of "Umbrella" was a hit in Germany, Spain, the Netherlands, Belgium, Finland, Iceland, Austria, Switzerland, Sweden and Norway and charted in all seven countries.

source: Wikipedia