Grand Funk Railroad is an American power trio band. Not usually well-received by critics, the original Grand Funk Railroad lineup was highly popular during the 1970s, having sold over 25 million records and selling out arenas world-wide. They were often cited as 'the loudest rock and roll band in the world.' The current Grand Funk Railroad lineup uses the nickname 'The American Band', from their hit song 'We're An American Band'.