Palladium ( /pəˈleɪdiəm/ pə-LAY-dee-əm) is a chemical element with the chemical symbol Pd and an atomic number of 46. It is a rare and lustrous silvery-white metal discovered in 1803 by William Hyde Wollaston. He named it after the asteroid Pallas, which was itself named after the epithet of the Greek goddess Athena, acquired by her when she slew Pallas. Palladium, platinum, rhodium, ruthenium, iridium and osmium form a group of elements referred to as the platinum group metals (PGMs). These have similar chemical properties, but palladium has the lowest melting point and is the least dense of them.

The unique properties of palladium and other platinum group metals (PGMs) account for their widespread use. A quarter of all goods manufactured today either contain PGMs or have a significant part in their manufacturing process played by PGMs. Over half of the supply of palladium and its congener platinum goes into catalytic converters, which convert up to 90% of harmful gases from auto exhaust (hydrocarbons, carbon monoxide, and nitrogen dioxide) into less-harmful substances (nitrogen, carbon dioxide and water vapor). Palladium is also used in electronics, dentistry, medicine, hydrogen purification, chemical applications, and groundwater treatment. Palladium plays a key role in the technology used for fuel cells, which combine hydrogen and oxygen to produce electricity, heat, and water.

Héctor Juan Pérez Martínez (September 30, 1946 – June 29, 1993), better known as Héctor Lavoe, was a Puerto Rican salsa singer. Lavoe was born and raised in the Machuelito sector of Ponce, Puerto Rico. Early in his life, he attended a local music school and developed an interest inspired by Jesús Sánchez Erazo. He moved to New York City when he was 17 years old. On his first week living in the city, he worked as the vocalist of a sextet formed by Roberto García. During this period, he performed with several other groups, including Orquesta New York, Kako All-Stars, and the Johnny Pacheco band.

In 1967, Lavoe joined Willie Colón's band and performed as the band vocalist. With the Willie Colón band, Lavoe recorded several hit songs, including "El Malo" and "Canto a Borinquen". While working with the Willie Colón band, Lavoe became addicted to drugs and began to habitually be late when scheduled to perform with the band. Colón eventually decided to not work with Hector on stage but they still remained good friends and made music in the studio together. Lavoe moved on to become a soloist and formed his own band, where he performed as lead vocalist. As a soloist Lavoe recorded several hits including "El cantante", "Bandolera" and "Periódico de ayer" ("El Cantante" was composed by Ruben Blades, "Bandolera" by Colón and "Periódico" by Tite Curet Alonso.) During this period he was frequently featured as an invited vocalist in the Fania All Stars, and recorded numerous tracks with the band.

Robert Peter "Robbie" Williams (born 13 February 1974) is an English singer-songwriter, vocal coach and occasional actor. He is a member of the pop group Take That.

Williams rose to fame in the band's first run in the early- to mid-1990s. After many disagreements with the management and certain group members, Williams left the group in 1995 to launch his solo career. On 15 July 2010, it was announced he had rejoined Take That and that the group intended to release a new album in November 2010 which became the second fastest-selling album of all-time in UK chart history and the fastest-selling record of the century.

Williams has sold over 70 million records worldwide, which ranks him among the best-selling music artists worldwide. He is the best-selling British solo artist in the United Kingdom and the best selling non-Latino artist in Latin America. Six of his albums are among the top 100 biggest-selling albums in the United Kingdom. He has also been honoured with seventeen BRIT Awards—more than any other artist—and seven ECHO Awards. In 2004, he was inducted into the UK Music Hall of Fame after being voted as the "Greatest Artist of the 1990s."