Glycerol (or glycerine, glycerin) is a simple polyol compound. It is a colorless, odorless, viscous liquid that is widely used in pharmaceutical formulations. Glycerol has three hydroxyl groups that are responsible for its solubility in water and its hygroscopic nature. The glycerol backbone is central to all lipids known as triglycerides. Glycerol is sweet-tasting and of low toxicity.

Glycerol forms the backbone of triglycerides, and is chiefly produced by saponification of fats as a byproduct of soap-making.

It is also a byproduct of the production of biodiesel via transesterification. This form of crude glycerin is often dark in appearance with a thick, syrup-like consistency. Triglycerides (1) are treated with an alcohol such as ethanol (2) with catalytic base to give ethyl esters of fatty acids (3) and glycerol (4):

Glycerol is also produced by various routes from propylene. The epichlorohydrin process is the most important; it involves the chlorination of propylene to give allyl chloride, which is oxidized with hypochlorite to dichlorohydrins, which reacts with a strong base to give epichlorohydrin. Epichlorohydrin is then hydrolyzed to give glycerol.

Gavin McGregor Rossdale (born 30 October 1965) is an English musician, known as the lead singer and rhythm guitarist of the rock band Bush as well as an actor. Following Bush's separation in 2002, which lasted for eight years, he was the lead singer and guitarist for Institute, and later began a solo career. He continues to perform both Bush and Institute songs during his solo concerts. Rossdale is married to fellow musician Gwen Stefani.

Rossdale was born in Kilburn, London, the son of Barbara Stephan (Bowie) and Douglas Rossdale, a doctor. His mother was born in Scotland and his father's parents were of Russian Jewish descent, the family's surname originally being Rosenthal. His parents divorced when he was eleven years old, and he was raised primarily by his father and aunt. His mother remarried and moved to Tampa, Florida. Rossdale has a younger sister, Soraya, and an elder one, Lorraine. Rossdale's half brother, David Rossdale, is the Bishop of Grimsby (a suffragan in the Diocese of Lincoln). Rossdale's half sister, Georgina Rossdale-Smith, is a doctor.

Gwen Renée Stefani ( /stɛˈfɑːni/; born October 3, 1969) is an American singer-songwriter and fashion designer. Stefani is the lead vocalist for the rock and ska band No Doubt. Stefani recorded Love. Angel. Music. Baby., her first solo album, in 2004. The album was inspired by music of the 1980s and was a success with sales of over seven million copies. The album's third single, "Hollaback Girl", was the first US digital download to sell one million copies. Stefani's second solo album, The Sweet Escape (2006), yielded "Wind It Up", "4 in the Morning", and the highest-selling single "The Sweet Escape". Including her work with No Doubt, Stefani has sold more than forty million albums worldwide. She won the World's Best-Selling New Female Artist at the World Music Awards 2005.

In 2003, she debuted her clothing line L.A.M.B. and expanded her collection with the 2005 Harajuku Lovers line, drawing inspiration from Japanese culture and fashion. Stefani performs and makes public appearances with four back-up dancers known as the Harajuku Girls dancers. She married British grunge musician Gavin Rossdale in 2002 and they have two sons: Kingston James McGregor Rossdale, born May 26, 2006, and Zuma Nesta Rock Rossdale, born August 20, 2008. Billboard magazine named Stefani the fifty-fourth artist and thirty-seventh Hot 100 artist of the 2000–09 decade.

Susan Kay "Suzi" Quatro (born 3 June 1950) is a British-based American singer-songwriter, bass guitar player, and actor. She is the first female bass player to become a major rock star — this success in the 1970s empowered women (at a time when rock was dominated by men).

In the 1970s Quatro scored a string of hit singles that initially found greater success in Europe and Australia than in her homeland. But, following a recurring role as a female bass player on the popular American sitcom Happy Days, her duet "Stumblin' In" with Chris Norman reached number 4 in the USA.

Between 1973 and 1980 Quatro was awarded six Bravo Ottos. In 2010 she was voted into the Michigan Rock and Roll Legends online Hall of Fame.

She continues to create new albums, to perform, and to research/present new radio programmes.

Quatro played the bass guitar in the all-female bands The Pleasure Seekers and Cradle with her sisters Patti, Nancy, and Arlene. Also, according to her autobiography, her first bass guitar was a 1957 Fender Precision, given to her by her father.