Question: American singer Steve Earle has released how many studio albums, including a collaboration with bluegrass artist Del McCoury, Delano Floyd McCoury was born in Bakersville, North Carolina in 1939, but the family relocated to York County, Pennsylvania while he was still a child, is an American bluegrass musician?
Context: North Carolina is known particularly for its tradition of old-time music, and many recordings were made in the early 20th century by folk song collector Bascom Lamar Lunsford.  Most influentially, North Carolina country musicians like the North Carolina Ramblers and Al Hopkins helped solidify the sound of country music in the late 1920s, while influential bluegrass musicians such as Earl Scruggs, Doc Watson and Del McCoury came from North Carolina.  Arthur Smith is the most notable North Carolina musician/entertainer who had the first nationally syndicated television program which featured country music.  Smith composed "Guitar Boogie", the all-time best selling guitar instrumental, and "Dueling Banjos", the all-time best selling banjo composition.  Country rock star Eric Church from the Hickory area has had 2 #1 albums on the Billboard 200, including "Chief" in 2011.  Both North and South Carolina are a hotbed for traditional country blues, especially the style known as the Piedmont blues.  Elizabeth Cotten, from Chapel Hill, was active in the American folk music revival. Ronnie McCoury is a mandolin player, singer, and songwriter born March 16, 1967.  He is the son of bluegrass musician Del McCoury, and is best known for his work with the Del McCoury Band Weather and Water is a 2005 studio album by the Austin, Texas progressive bluegrass band The Greencards.  Their second Dualtone album release of 2005, after their debut 2003 album "Movin' On" was re-released earlier in the year by their label Dualtone Records, "Weather and Water" was released on June 28.  In a review of "Weather and Water" in "The Washington Post", it was noted that on this album, unlike their debut, the focus was on the music supporting lyrics, rather than the blues virtuosity of "Movin' On".  In another review, Jim Abbott of the "Tribune News Service" described The Greencards as polished, "earthy, charming roots music with a sophisticated sheen", but noted that some bluegrass purists may miss the vocal idiosyncrasies that can be found on other bluegrass bands such as the Del McCoury Band.  All three members of the band sing on "Weather and Water", but Young's voice was noted for its "dreamy, haunting quality".  Their music through the "Weather and Water" album had been called Celtic-influenced and bluegrass-flavored, but noted that the band had a distinctly American sound despite their overseas origins. The Mountain is the eighth studio album by Steve Earle (backed the Del McCoury Band), released in 1999 (see 1999 in music). David R. "Fergie" Ferguson (born July 2, 1962 in Nashville, Davidson County, Tennessee) began in the mid-1980s engineering Country Music recordings for "Cowboy" Jack Clement, at Clement's "Cowboy Arms Hotel and Recording Spa", in Nashville, Tennessee.  Today, Ferguson is best known for his works with Johnny Cash, as sound engineer on the highly successful Grammy Award winning American Recordings albums produced by Rick Rubin, in the 1990s and 2000s (decade).  Ferguson has also engineered or produced recordings for such artists as folk music legend John Prine, bluegrass music artist Mac Wiseman, The Del McCoury Band, country music legends Charley Pride, Eddy Arnold, rock-n-roll band U2, and many others.  Ferguson appeared as himself in the U2 film, "Rattle and Hum", and portrayed his mentor and once real-life boss, Jack Clement in the Jerry Lee Lewis film, Great Balls of Fire! .  Ferguson maintains a recording studio in Nashville, and resides in nearby Goodlettsville, Tennessee, near his boyhood home. American singer Steve Earle has released sixteen studio albums, including a collaboration with bluegrass artist Del McCoury.  Earle's work reflects a wide range of styles, including bluegrass, roots rock, folk, blues and country.  He or his labels have also released six live albums and eight compilation albums. Delano Floyd McCoury was born in Bakersville, North Carolina in 1939, but the family relocated to York County, Pennsylvania while he was still a child, is an American bluegrass musician.  As leader of the Del McCoury Band, he plays guitar and sings lead vocals along with his two sons, Ronnie McCoury and Rob McCoury, who play mandolin and banjo respectively.  In June 2010, he received a National Heritage Fellowship lifetime achievement award from the National Endowment for the Arts and in 2011 he was elected into the International Bluegrass Music Hall of Fame. Early Dawg is the debut solo studio album by American mandolinist David Grisman.  With Del McCoury on guitar and vocals, Jerry McCoury on bass, Bill Keith on banjo plus other well-known musicians, Grisman offers a mix of traditional songs, compositions by Bill Monroe and his own contributions, mainly of bluegrass and progressive bluegrass style. The Grascals is the eponymous debut album of the American bluegrass music group The Grascals, released by Rounder Records in early 2005.  Dolly Parton does a guest spot on the song "Viva Las Vegas".  This album also launched The Grascals career, winning them Song of the Year and Emerging Artist of the Year.  Also, winning them a nomination for Album of the year.  This album also earned them a Grammy nomination in Best Bluegrass Album of the Year, losing to the Del McCoury Band.  This album also debuted at number 3 on the "Billboard" Bluegrass Charts. Chatham County Line is an American bluegrass musical group.  Formed in Raleigh, North Carolina, in 1999 from members of the band Stillhouse, the band has released seven albums including six on the Yep Roc label (whom they were linked with by the producer Chris Stamey), and have become popular in Europe as well as their native United States.  Their most recent tour took in numerous European destinations, including the Lowlands rock festival in the Netherlands.  Chatham County Line made their Canadian debut in July 2009 at the Winnipeg Folk Festival, where they performed beside The Del McCoury Band and The Punch Brothers.
Answer: sixteen