The Baseballs is a German Rock\\\'n\\\'Roll band founded in Berlin in 2007. They became popular with rock\\\'n\\\'roll versions in the style of the 60s of modern hits such as Umbrella by Rihanna and Hot\\\'n Cold by Katy Perry. The band members are only credited by their first names. Their version of Umbrella was a hit in Germany, Finland, Austria, Switzerland and Sweden and got into the charts in all five countries. Their debut album, Strike!, was released in May 2009 in Germany, Switzerland and Austria, in October 2009 in Finland and in December 2009 in Sweden and in February in Norway. It reached #15 in Austria, #6 in Germany, #2 in the Swiss, #1 in Finland, #1 in Sweden and #8 in the Norwegian album charts. \"Hot n Cold\" is a song by American singer Katy Perry. The song was written and composed by Dr. Luke, Max Martin, and Perry for her second album, One of the Boys. The track was released as the album\'s second single. Its chorus features a series of binary opposites (hot/cold, up/down, black/white) to emphasise the unstable nature of the characters\' relationship. It reached number three on the Billboard Hot 100, making it Perry\'s second consecutive top three single, after her previous worldwide hit \"I Kissed a Girl\". The single has also become Perry\'s second top five single in dozens of countries around the world, including the United Kingdom, Australia, Ireland and New Zealand, as well as topping the charts in Turkey, Finland, Germany, Greece, Canada, Norway and Denmark. It has topped the charts in more than 25 countries.