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www.reference.com/article/history-country-music-17173065c369585c

Country music is believed to have officially begun in 1927, when Victor Records signed the Carter Family and Jimmie Rogers. The genre became very popular in the 1940s and 50s, and many aspects of country music have influenced other genres, as well as American culture.

www.reference.com/article/periodic-time-fe48db9a73b7826b

In the geological time scale, periods are the third largest interval used to divide the Earth's history into segments of time. The year 2015 is in the Quaternary Period which began 1.6 million years earlier.

www.reference.com/article/can-definition-time-period-found-4372aa80c1858368

The definition of “time period” is available on many dictionary and reference resources, such as TheFreeDictionary.com, BusinessDictionary.com and Dictionary.com. Both websites define the term “time period” as a measured amount of time between two points or occurrences.

www.reference.com/article/causes-early-periods-b74795472c231475

Some of the causes of early periods include hormone imbalances, stress and diet. Birth control can also cause early or irregular periods.

www.reference.com/article/history-rap-music-1c5fa30c52c0a5d9

Although some scholars suggest that the roots of rap music are in the tribal instrumental chants dating back thousands of years, most agree that it did not fully emerge as a music genre until the 1970s. It was created in direct response to disco.

www.reference.com/article/history-military-time-c5dbd7e770712dc6

The history of military time starts in the Egyptian times, specifically the 11th Egyptian dynasty (est. 2100 B.C.). It was the Egyptians who first used the 24-hour clock, and proof was found on a coffin lid known as the Diagonal Star Table. Later on, as warfare progressed, various military forces ha

www.reference.com/article/good-old-time-country-music-songs-506780fa342f8df9

Popular old-time country music songs include Tammy Wynette's "Stand By Your Man," Garth Brooks' "Friends in Low Places," Glen Campbell's "Galveston" and Alabama's "Mountain Music." The songs are built around a classic, old-fashioned country sound with fiddles, steel guitars and lyrics that pay tribu

www.reference.com/world-view/brief-history-r-b-music-3aecba3a9660b536

Rhythm and blues music originated in the 1940s when African-American artists combined blues-style song structures and jazz instrumentation with the heavier sound of electric guitars and bass. The new R&B format's distinctive sound paved the pay for the development of rock and roll in the 1950s, soul

www.reference.com/world-view/did-period-three-times-one-month-26c0eefb335f3081

Uterine bleeding between expected menstrual cycles, or metrorrhagia, is a common problem, especially in teenage and pre-menopausal women, explains Core Physicians. There are many possible causes for metrorrhagia, including hormone imbalance, polyps on the cervix or in the uterus, infection, and use

www.reference.com/article/longest-time-between-periods-5801d3b0d2ac9b0b

The longest normal time between periods is 35 days. Although it is abnormal for periods to occur more than 35 days apart, there are exceptions when this is considered normal.