Question: Cynthia May Carver, known professionally as Cousin Emmy, was a banjo player and country singer who was one of the pioneering solo female stars in the country music industry, her song "Ruby, Are You Mad at Your Man?", became a bluegrass standard after it was covered by the Osborne Brothers, were an influential and popular bluegrass act. during which time period?

Context articles: John R. Cash
Cousin Emmy
Kitty Wells
Carlton Haney
Osborne Brothers
Leroy Troy
Lonesome Pine Fiddlers
Danny Barnes (musician)
Davidson Brothers
Sonny Osborne

John R. Cash is the 51st overall album by country singer Johnny Cash, released in 1975 on Columbia Records.
 It consists mostly of covers of other musicians' songs.
 The first track on the album, a song titled "My Old Kentucky Home", is not the state song of Kentucky, but a composition by Randy Newman which had been previously recorded by the Osborne Brothers in 1970 and Three Dog Night in 1972; Cash's version, like that of the Osborne Brothers five years previous, was released as the second single from the album, though the previously issued single "The Lady Came from Baltimore" had achieved greater success on the charts, reaching #14.
 The Cash original "Lonesome to the Bone" had previously appeared on "Ragged Old Flag" (1974) and would make one more appearance on "Silver" (1979).
Cynthia May Carver (March 14, 1903 – April 11, 1980), known professionally as Cousin Emmy, was a banjo player and country singer who was one of the pioneering solo female stars in the country music industry.
 Although hit records eluded her, she proved to be a major name in personal appearances and on radio in the 1940s and 50s.
 In the 1960s she gained a new audience on the folk music circuit.
 Her song "Ruby, Are You Mad at Your Man?"
 became a bluegrass standard after it was covered by the Osborne Brothers.
 She started out her career by playing with Frankie Moore's Log Cabin Boys.
 She influenced the playing of Grandpa Jones.
 She appeared in two films, "Swing in the Saddle" and "The Second Greatest Sex".
Ellen Muriel Deason (August 30, 1919 – July 16, 2012), known professionally as Kitty Wells, was an American pioneering female country music singer.
 She broke down a female barrier in country music with her 1952 hit recording, "It Wasn't God Who Made Honky Tonk Angels" which also made her the first female country singer to top the U.S. country charts, and turned her into the first female country star.
 Her Top 10 hits continued until the mid-1960s, inspiring a long list of female country singers who came to prominence in the 1960s.
Lawrence Carlton Haney (September 19, 1928 – March 16, 2011) was an American booking agent, festival promoter, and songwriter primarily active in bluegrass music.
 Once dubbed “The P.T. Barnum of Country Music” for his large personality, Haney is best known for the organizing first multi-day bluegrass music festival as well as influencing the careers of the Osborne Brothers, Porter Wagoner, Conway Twitty, Merle Haggard and Loretta Lynn.
 He was inducted to the Bluegrass Hall of Fame in 1998 by the International Bluegrass Music Association.
The Osborne Brothers, Sonny Osborne (b. October 29, 1937) and Bobby Osborne (b. December 7, 1931), were an influential and popular bluegrass act during the 1960s and 1970s.
 They are probably best known for their No. 33 1967 country hit song, "Rocky Top", written by Felice and Boudleaux Bryant and named after a fictional Tennessee location.
Troy Boswell (born May 23, 1966), known professionally as Leroy Troy, is an old-time banjo player from Goodlettsville, Tennessee.
 His banjo style is the clawhammer or frailing style, distinct from more commonly found Scruggs style banjo playing in modern bluegrass.
 He often performs humorous or comedy songs from the old-time music genre.
 Troy often uses a washboard with various sound making devices affixed to it.
 The "Bicycle Wreck" song is often played by Troy on the washboard.
 Major musical influence attributed to Uncle Dave Macon and others taught by him.
 Troy debuted on the Grand Ole Opry in 1988 and was the National Old-Time Banjo Champion in 1996.
The Lonesome Pine Fiddlers (1938- 1966) were an early bluegrass band which included such notable "first generation" bluegrass musicians as Ezra Cline, Bobby Osborne, Paul Williams, Melvin Goins, Charlie Cline, Curly Ray Cline, Larry Richardson and for a short time Jimmy Martin.
 The group was started by Ezra Cline and Curly Ray Cline and was originally named "Cousin Ezra and the Lonesome Pine Fiddlers".
 The Clines came from a large family consisting of musically talented people.
 Ray and Charlie's father, Charlie, was a talented banjo player and the women in the family, Geraldine and Bobbi, were great singers.
 For reasons unknown, Bobbi and Geraldine never joined the band on the road but often joined in at home, especially when notable Country singers, such as Bill Monroe, Lester Flatt and Earl Scruggs, and Hank Williams, came visiting.
 None of them ever had a music lesson yet excelled on every instrument they touched.
 Natives of the Gilbert Creek region of southern West Virginia, Cousin Ezra, along with brothers Ireland (Lazy Ned) and Curly Ray Cline, were part of the original Lonesome Pine Fiddlers from about 1938, a group that worked on radio at WHIS Bluefield, West Virginia.
 During World War II, Ned was killed in action.
 When the Pine Fiddlers resumed regular daily broadcasts, Charlie, who played multiple instruments, joined them on a regular basis.
 Charlie returned to the Fiddlers briefly before becoming a member of Bill Monroe's Blue Grass Boys.
 During 1952-1955, Charlie worked off and on with Monroe, recording some 38 songs, all on Decca.
 It has been said that he played every instrument at one time or another in the Monroe group except mandolin.
 Charlie spent most of 1953 back with the Lonesome Pine Fiddlers working at WJR radio in Detroit.
 When Ezra brought the band to Pikeville, Kentucky, in November, Charlie rejoined Bill Monroe.
 In 1954, Charlie did a session, playing lead guitar, with the Stanley Brothers and also another one on RCA with the Fiddlers, although he was not otherwise working with them at the time.
 He also worked briefly as a sideman with the Osborne Brothers, although he did not record with them.
 By 1958, Charlie (electric lead guitar) and his wife, Lee (electric bass), had rejoined Ezra and Curly Ray in the Lonesome Pine Fiddlers, who were experimenting with a more modern sound and working a TV show in Huntington, West Virginia, in addition to daily radio in Pikeville.
 In his later years, Charlie was with the Stanley Brothers.
 Curly Ray also played with the Stanley Brothers at a different time as their fiddler.
 Curly Ray was one of the best fiddlers in Bluegrass.
 This most talented family of musicians were the best, surpassed by none.
 Finally, on October 1, 2009, The Lonesome Pine Fiddlers got their due when they were inducted into the International Bluegrass Hall of Fame at the Ryman Theater (the original home of the Grand Ole Opry).
 Bobby Osborne, Melvin Goins and Paul Williams were there to receive the bands award.
 In the crowd of a sold out theater was the son of Ezra Cline, Scotty Ireland Cline, who recalled being in that same theater as a child sitting on stage and watching the Fiddlers play.
 (At the time, the Opry had bleachers for family just off stage).
 The final act of the evening at the IBMA Awards was the playing of "Pain in my Heart" by Osborne, Goins and Williams along with a Song from the Dillards, who were also inducted the same evening.
Danny Barnes (born December 21, 1961) is a banjo player, singer, and composer whose music is influenced by country, jazz, blues, punk, metal, and more.
 He has been described as a "banjo virtuoso" and is "widely acknowledged as one of the best banjo players in America."
 He was a founding member of the Austin trio the Bad Livers, with whom he toured and recorded extensively from 1990 to 2000.
 Since then, he has performed and recorded as a solo artist, as well as collaborating with Bill Frisell, Dave Matthews, Jeff Austin and other musicians.
 In 2013, Barnes and Max Brody formed the Test Apes.
 In September 2015, Barnes was awarded the Steve Martin Prize for Excellence in Banjo and Bluegrass, in recognition of his role as "one of bluegrass music’s most distinctive and innovative performers."
 Martin’s website said of Barnes’ work: "The raw and unpolished musical breadth of his compositions has propelled him across the industry today."
The Davidson Brothers, "Bluegrass wizards", originally from Yinnar, Victoria, consist of brothers Hamish and Lachlan Davidson.
 They have written and performed together since their youth, "they are multi-instrumentalists on banjo, fiddle, and mandolin and have won many awards on the country circuit."
 They released their first album, "Blue Spruce", in 1999 when they were both in their early teens.
 This was the beginning of what would span into numerous recordings and national awards.
 "With their dynamic brand of classic bluegrass and more contemporary newgrass music, the pair has not only blitzed the Australian country music industry, but has attracted plenty of attention in the United States and Europe as well."
Sonny Osborne (born October 29, 1937 in Hyden, Kentucky) is a bluegrass singer and five-string banjo player.
 A master of the style developed by Earl Scruggs, called the "Scruggs style", he is best known for his collaboration with his brother Bobby Osborne as the Osborne Brothers.