"Born to Be Wild" is a song written by Mars Bonfire and first released as a single by Steppenwolf. Although the lyrics do not specifically mention motorcycles, the song is often invoked in both popular and counterculture to denote a biker appearance or attitude since being featured in the 1969 film Easy Rider. Sometimes, "Born to Be Wild" is described as the first heavy metal song, and the second-verse lyric "heavy metal thunder" marks the first use of this term in rock music (although not as a description of a musical style, but rather a motorcycle).