The Celts (usually pronounced  /ˈkɛlts/ but sometimes /ˈsɛlts/, see pronunciation of Celtic) or Kelts were an ethno-linguistic group of tribal societies in Iron Age and Medieval Europe who spoke Celtic languages and had a similar culture.

The earliest archaeological culture that may justifiably be considered as Proto-Celtic is the Late Bronze Age Urnfield culture of central Europe from the last quarter of the second millennium BC. Their fully Celtic descendants in central Europe were the people of the Iron Age Hallstatt culture (c. 800-450 BC) named for the rich grave finds in Hallstatt, Austria. By the later La Tène period (c. 450 BC up to the Roman conquest), this Celtic culture had expanded over a wide range of regions, whether by diffusion or migration: to the British Isles (Insular Celts), France and The Low Countries (Gauls), much of Central Europe, the Iberian Peninsula (Celtiberians, Celtici and Gallaeci) and northern Italy (Golaseccans and Cisalpine Gauls) and following the Gallic invasion of the Balkans in 279 BC as far east as central Anatolia (Galatians).

Robert Anthony Plant, CBE (born 20 August 1948) is an English singer and songwriter best known as the vocalist and lyricist of the iconic rock band Led Zeppelin. He has also had a successful solo career. In 2007, Plant released Raising Sand, an album produced by T-Bone Burnett with American bluegrass soprano Alison Krauss, which won the 2009 Grammy Award for Album of the Year at the 51st Grammy Awards.

With a career spanning more than 40 years, Plant is regarded as one of the most significant singers in the history of rock music, and has influenced contemporaries and later singers such as Freddie Mercury and Axl Rose. In 2006, heavy metal magazine Hit Parader named Plant the "Greatest Metal Vocalist of All-Time". In 2009, Plant was voted "the greatest voice in rock" in a poll conducted by Planet Rock. In 2011, a Rolling Stone readers' pick placed Plant in first place of the magazine's "Best Lead Singers of All Time".

Plant was born in the Black Country town of West Bromwich (then in Staffordshire now in West Midlands) to parents Robert C. who worked as a civil engineer and Annie C. (Cain) Plant, but grew up in Kidderminster, in Worcestershire. Plant gained an interest in singing and rock and roll music at an early age.

Peter Brian Gabriel (born 13 February 1950) is an English singer, musician, and songwriter who rose to fame as the lead vocalist and flautist of the progressive rock group Genesis. After leaving Genesis, Gabriel went on to a successful solo career. His 1986 album, So, is his most commercially successful, and the album's biggest hit, "Sledgehammer", won a record nine MTV Awards at the 1987 MTV Video Music Awards, and the song is the most played music video in the history of the station.

More recently, Gabriel has focused on producing and promoting world music and pioneering digital distribution methods for music. He has also been involved in various humanitarian efforts. Gabriel has won numerous music awards throughout his career, including three Brit Awards—winning Best British Male in 1987, six Grammy Awards, thirteen MTV Video Music Awards, and in 2007 he was honoured as a BMI Icon at the 57th annual BMI London Awards for his “influence on generations of music makers.” Gabriel was also awarded the Polar Music Prize in 2009, and was inducted into the Rock and Roll Hall of Fame as a member of Genesis in 2010.