Joseph Wayne McVey (born January 19, 1977), better known by his stage name Z-Ro, is an American rapper, singer and producer from Houston, Texas. He was named one of America's most underrated rappers by the New York Times.

Z-Ro was born Joseph Wayne McVey in Houston’s notorious South Park neighborhood on January 19, 1977. At age six his mother died, and he was shuttled from household to household in search of stability, eventually settling in the Ridgemont area of Missouri City, Texas. When Z-Ro reached his late teens he was unemployed and resorted to drug dealing and hustling on the streets. According to Z-Ro, listening to the music of 2Pac, Geto Boys, Street Military, K-Rino and Klondike Kat inspired him to work harder for his goal of leaving the streets. Z-Ro discovered his talent of freestyle rapping and after going through a couple of recording studios to make a demo, the CEO of a local label discovered and signed him.

In 1998, Z-Ro released his debut album, Look What You Did to Me. Z-Ro is also a member of the original Screwed Up Click, an assortment of rappers from Houston. All of these things helped to escalate Z-Ro’s popularity throughout the South and by 2002 his talent and hard work caught the attention of Rap-a-Lot’s founder and CEO James Prince, who offered him a deal.

Yegor (Egor) Ivanovich Zolotarev (Russian: Его́р Ива́нович Золотарёв) (March 31, 1847, Saint Petersburg – July 19, 1878, Saint Petersburg) was a Russian mathematician.

Yegor was born as a son of Agafya Izotovna Zolotareva and the merchant Ivan Vasilevich Zolotarev in Saint Petersburg, Imperial Russia. In 1857 he began to study at the fifth St Petersburg gymnasium, a school which centred on mathematics and natural science. He finished it with the silver medal in 1863. In the same year he was allowed to be an auditor at the physico-mathematical faculty of St Petersburg university.

He had not been able to become a student before 1864 because he was too young. Among his academic teachers were Somov, Chebyshev and Korkin, with whom he would have a tight scientific friendship. In November 1867 he defended his Kandidat thesis “About the Integration of Gyroscope Equations”, after 10 months there followed his thesis pro venia legendi About one question on Minima. With this work he was given the right to teach as a private lecturer at St Petersburg university.

Terence Michael Joseph "Geezer" Butler (born 17 July 1949 in Birmingham, England) is an English musician and songwriter. Butler is best known as the bassist and lyricist of heavy metal band Black Sabbath. He was also involved in Heaven & Hell from 2006 to 2010.

Butler formed his first band, Rare Breed, with old friend John "Ozzy" Osbourne in the autumn of 1967. Separated for a time, Osbourne and Butler reunited in the blues foursome, Polka Tulk, along with guitarist Tony Iommi and drummer Bill Ward. They renamed their band Earth, but after finding a band in the small-time English circuit with the same name, soon adopted Black Sabbath in early 1969.

Butler played rhythm guitar in his pre-Sabbath days, including with Rare Breed, but when Sabbath was formed, Iommi made it clear that he would not want to play with another guitarist, so Butler moved to bass.

Butler is noted as being one of the first bassists to use a Wah-wah pedal on his bass, as showcased at the beginning of "N.I.B." which inspired many later bassists. He was also one of the first bassists to down-tune (from the standard EADG to the lower C#F#BE), in order to match Iommi who had started tuning his guitar to C# (one and a half steps down). While Ozzy Osbourne was the frontman of the band, Butler wrote almost all of the band's lyrics, drawing heavily upon his fascination with religion, science-fiction, fantasy and horror, and musings on the darker side of human nature that posed a constant threat of global annihilation.