The genre is usually said to have been invented by Dick Dale on "Let's Go Trippin'", which became a hit throughout California. However, Duane Eddy's "Movin' and Groovin" is thought by many to be the main contender for laying the groundwork as the first Surf record. The opening riff of Duane's record was used by the Beach Boys for their own "Surfin USA". By the mid-1960s, the Beach Boys had emerged as the dominant surf group; they used complex pop harmonies over a basic surf rock rhythm.