Roger the Engineer (original UK title: Yardbirds, US, German, and French title: Over Under Sideways Down) is an album by the English blues rock band The Yardbirds, released in 1966. It was produced by bassist Paul Samwell-Smith and Simon Napier-Bell. It was the only Yardbirds album with all original material. Although the record was officially titled Yardbirds (and still is in authoritative chart sources, such as The Guinness Book of British Hit Albums), it has since been referred to, first colloquially, then semi-officially, as Roger the Engineer, a title stemming from the cover drawing of the record's audio engineer Roger Cameron by band member Chris Dreja. Due to the influence of Jeff Beck's experimentation with guitar distortion, the album is considered a precursor to heavy metal.