Question: Mark Heard was originally from the city nicknamed what?

full_context: Document 1: Strong Hand of Love: A Tribute to Mark Heard: Strong Hand of Love: A Tribute to Mark Heard is a compilation of songs by various artists in tribute to songwriter, Mark Heard.
Document 2: Macon, Georgia: Macon (officially Macon–Bibb County) is a city located in the state of Georgia, United States. Macon lies near the geographic center of the state, approximately 85 mi south of Atlanta, hence the city's nickname "the Heart of Georgia."
Document 3: Robert John &quot;Mutt&quot; Lange: Robert John "Mutt" Lange ( ; born 11 November 1948) is a South African record producer and songwriter. He is known for his work in the studio and innovations in multitrack recording and producing many of history's greatest rock albums. He has produced albums for, or otherwise worked with, artists such as AC/DC, Britney Spears, Def Leppard, The Boomtown Rats, Foreigner, Michael Bolton, The Cars, Bryan Adams, Huey Lewis and the News, Billy Ocean, The Corrs, Maroon 5, Lady Gaga, Nickelback, and Muse. He also wrote and produced songs with his then-wife, Canadian singer Shania Twain. Her 1997 album "Come On Over", which he produced, is the best-selling country music album, the best-selling studio album by a female act, the best-selling album of the 1990s, and the 9th best-selling album in the United States.
Document 4: Mercer University: Mercer University is the oldest private university in Georgia with its main campus in Macon, Georgia, United States.
Document 5: Athens, Georgia: Athens (formally known as Athens-Clarke County) is a consolidated city–county in the U.S. state of Georgia, in the northeastern part of the state about an hour's drive from the global city of Atlanta, and comprising the former city of Athens proper (the county seat) and Clarke County. The University of Georgia, the state's flagship public research university, is located in this college town, and contributed to its initial growth. In 1991, after a vote the preceding year, the original city abandoned its charter to form a unified government with Clarke County, referred to jointly as Athens-Clarke County. As of the 2010 census, the consolidated city-county (including all of Athens-Clarke County except Winterville and a portion of Bogart) had a total population of 115,452; all of Clarke County had a population of 116,714. Athens is the sixth-largest city in Georgia, and the principal city of the Athens-Clarke County, Georgia Metropolitan Statistical Area, which had a population of 192,541 as of the 2010 census. Athens-Clarke County has the smallest geographical area of a county in Georgia.
Document 6: Milledgeville, Georgia: Milledgeville is a city in and the county seat of Baldwin County in the U.S. state of Georgia. It is northeast of Macon and bordered on the east by the Oconee River. The rapid current of the river here made this an attractive location to build a city. It was the capital of Georgia from 1804 to 1868, notably during the American Civil War. Milledgeville was preceded as the capital city by Louisville and was succeeded by Atlanta, the current capital. Today U.S. Highway 441 connects Milledgeville to Madison, Athens, and Dublin.
Document 7: Atlanta: Atlanta is the capital of and the most populous city in the U.S. state of Georgia, with an estimated 2016 population of 472,522. Atlanta is the cultural and economic center of the Atlanta metropolitan area, home to 5,710,795 people and the ninth-largest metropolitan area in the United States. Atlanta is the county seat of Fulton County, and a small portion of the city extends eastward into DeKalb County.
Document 8: Ken Caillat: Kenneth Douglas Caillat ( ;) is an American record producer. He is best known for engineering the Fleetwood Mac albums "Rumours", "Tusk", "Mirage", "Live", and "The Chain Box Set".
Document 9: Mark Selby (musician): Mark Otis Selby (1960/1961 – September 18, 2017) was an American blues rock singer-songwriter, guitarist, multi-instrumentalist, and record producer. Born in Enid, Oklahoma, he was a solo artist, signed to ZYX Records in Europe, and one half of performing duo with his wife, songwriter Tia Sillers. He also plays guitar in recording sessions for musical artists such as Kenny Rogers, Johnny Reid, Keni Thomas, Jimmy Hall, and Wynonna Judd.
Document 10: Mall of Georgia: Mall of Georgia is an enclosed super-regional shopping mall located in Gwinnett County, Georgia, near the city of Buford, 30 mi northeast of Atlanta. Built in 1999, it is currently the largest shopping mall in the state of Georgia, consisting of more than two hundred stores on three levels. The mall's anchor stores include Belk, Dillard's, JCPenney, Macy's and Von Maur, other major stores include Barnes & Noble, Dick's Sporting Goods, and Haverty's. Also, located in the Mall of Georgia Crossing is Best Buy, Nordstrom Rack, T.J. Maxx, and Target. Also featured in the mall is a large village section, comprising lifestyle tenants and restaurants in an outdoor setting, as well as a 500-seat amphitheater. The mall attracts many high end stores such as Coach, Swarovski, Clarks, J.Crew, and Aveda. Simon Property Group manages the Mall of Georgia.
Document 11: John Phillips (musician): John Edmund Andrew Phillips (August 30, 1935 – March 18, 2001) was an American singer, guitarist, songwriter, and promoter, most notably of the 1967 Monterey Pop Festival, a landmark event of the counterculture era and the Summer of Love. Known as Papa John, Phillips was a member and leader of the vocal group The Mamas & the Papas.
Document 12: Central Savannah River Area: The Central Savannah River Area (CSRA) is a trading and marketing region in the U.S. states of Georgia and South Carolina, spanning thirteen counties in Georgia and eight in South Carolina. The term was coined in 1950 by C.C. McCollum, the winner of a $250 contest held by "The Augusta Chronicle" to generate the best name for the area. Today the initialism is so commonly used that the full name is not known to all residents. The region is located on and named after the Savannah River, which forms the border between the two states. The largest cities within the CSRA are Augusta, Georgia and Aiken, South Carolina. (The CSRA does not include the city of Savannah, Georgia or any portion of the Savannah metropolitan area.)
Document 13: Mark Heard (album): Mark Heard is the first solo album by Mark Heard, originally released in 1975, and re-released as On Turning to Dust on both AB Records and Solid Rock Records in 1978.
Document 14: Mark Heard: John Mark Heard (December 16, 1951 – August 16, 1992) was an American record producer, folk rock singer, and songwriter originally from Macon, Georgia, United States. Heard released 16 albums, and produced and performed with many other artists as well, such as Sam Phillips (a.k.a. Leslie Phillips), Pierce Pettis, Phil Keaggy, Vigilantes of Love, Peter Buck of R.E.M. (who co-produced VOL's album "Killing Floor" with Heard), John Austin, The Choir, Randy Stonehill and Michael Been of The Call. Heard produced part of Olivia Newton-John's "The Rumor", which also included a cover of Heard's own "Big and Strong" (originally called "How to Grow Up Big and Strong").
Document 15: Georgia International Convention Center: The Georgia International Convention Center or GICC, opened in April 2009, is the second largest convention center in the U.S. state of Georgia, second only to the Georgia World Congress Center. It is located at 2000 Convention Center Concourse, just off Camp Creek Parkway (S.R. 6) and Roosevelt Highway (U.S. 29) in College Park. The Convention Center is accessible from the Airport MARTA station (via a connection to the ATL Skytrain), Interstate 285, and Interstate 85.
ground_truth: "the Heart of Georgia."