Medium trucks are larger than light but smaller than heavy trucks. They are often cited as pioneers of heavy metal music. Lower tunings are popular among rock and heavy metal bands. They started by playing covers of hardcore punk, punk rock and heavy metal songs. Mountain is one of the bands considered to be forerunners of heavy metal. Slayer is one of the most influential bands in heavy metal history. Support came from the Swedish heavy metal band Ghost. Lemmy's music was one of the foundations of the heavy metal genre. It is perfect for doing its job of producing large, heavy machinery. They tend to be very heavy and hot. Contrast loading is the alternation of heavy and light loads. Used in process of lifting heavy goods. Conveyors are especially useful in applications involving the transportation of heavy or bulky materials. Jericho is the lead singer for the heavy metal band Fozzy. Antibodies are composed of heavy and light chains.