Debuting with a revved-up R&B sound in the early '60s, UK rock legends The Moody Blues made a name for themselves by combining the grandeur of classical music with ambitious psychedelic flourishes. Their classic albums, like Days of Future Passed, helped define progressive rock, while their timeless pop hits established the group's mainstream success. After a short hiatus, they returned in the '80s with a New Wave and synth-pop-influenced sound, and continued to tour into the 2010s.