BOGOTA, Colombia (AP) — Colombians mourned on Monday over the death of musician Diomedes Diaz, the best-known performer of the country's accordion-heavy vallenato music.

Hundreds of people swarmed around a firetruck that carried his body for display in the main square of Valledupar, the singer-songwriter's hometown.

Mayor Fredys Soccaras told Venezuela's Caracol radio that Diaz died Sunday of a heart attack after being rushed to a hospital. He was 56.

From a poor childhood on a farm near Colombia's Caribbean coast, Diaz rose to become one of the top-selling artists of the musical genre revered in Colombia. He was honored with a Latin Grammy for best vallenato album in 2010.

Diaz was also known for his off-stage excesses, including a lifelong battle with drugs and alcohol and a conviction for trying to cover up the overdose death of a fan at his home.

His death came three days after he released a new CD.

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  • A man holds a poster of singer and composer Diomedes Diaz during his funeral mass at the main square of Valledupar, Colombia's northern state of Cesar, Wednesday, Dec. 25, 2013. Diomedes Diaz, one of the greatest performers of Colombia's accordion vallenato music, died Sunday, Dec. 22, 2013, at age 56. The poster reads in Spanish; "If life were stable all the time," a verse from the Diaz song, "La Plata." (AP Photo/Ricardo Mazalan)

  • A woman cries during the funeral Mass for singer and composer Diomedes Diaz at the main square of Valledupar, Colombia's northern state of Cesar, Wednesday, Dec. 25, 2013. Diaz, one of the greatest performers of Colombia's accordion vallenato music, died Sunday, Dec. 22, 2013, at age 56. (AP Photo/Ricardo Mazalan)

  • A boy plays the accordion during a musical homage to singer and composer Diomedes Diaz at the main square of Valledupar, in Colombia's northern state of Cesar, Wednesday, Dec. 25, 2013. Diomedes Diaz, one of the greatest performers of Colombia's accordion vallenato music, died Sunday, Dec. 22, 2013, at age 56. (AP Photo/Ricardo Mazalan)

  • From left to right, folklorist Felix Carillo, accordionist Andres Gil, singers Jorge Onate, Silvestre Dangond and Alfonso Zuleta embrace during a musical homage for singer and composer Diomedes Diaz after his funeral mass at the main square of Valledupar, Colombia's northern state of Cesar, Wednesday, Dec. 25, 2013. Diomedes Diaz, one of the greatest performers of Colombia's accordion vallenato music, died Sunday, Dec. 22, 2013, at age 56. (AP Photo/Ricardo Mazalan)

  • People sing during a musical homage to singer and composer Diomedes Diaz after his funeral mass at the main square of Valledupar, Colombia's northern state of Cesar, Wednesday, Dec. 25, 2013. Diomedes Diaz, one of the greatest performers of Colombia's accordion vallenato music, died Sunday, Dec. 22, 2013, at age 56. (AP Photo/Ricardo Mazalan)

  • People attend a funeral mass for singer and composer Diomedes Diaz at the main square of Valledupar, Colombia's northern state of Cesar, Wednesday, Dec. 25, 2013. Diomedes Diaz, one of the greatest performers of Colombia's accordion vallenato music, died Sunday, Dec. 22, 2013, at age 56. (AP Photo/Ricardo Mazalan)

  • Andres Gil plays the accordion during a musical homage to singer and composer Diomedes Diaz after his funeral mass at the main square of Valledupar, Colombia's northern state of Cesar, Wednesday, Dec. 25, 2013. Diomedes Diaz, one of the greatest performers of Colombia's accordion vallenato music, died Sunday, Dec. 22, 2013, at age 56. (AP Photo/Ricardo Mazalan)

  • A man sitting in a mango tree holds a poster of singer and composer Diomedes Diaz during his funeral mass at the main square of Valledupar, Colombia's northern state of Cesar, Wednesday, Dec. 25, 2013. Diomedes Diaz, one of the greatest performers of Colombia's accordion vallenato music, died Sunday, Dec. 22, 2013, at age 56. (AP Photo/Ricardo Mazalan)

  • Singer Rafael Santos Diaz kneels in front of the coffin of his father, singer and composer Diomedes Diaz, during a funeral mass at the main square of Valledupar, Colombia's northern state of Cesar, Wednesday, Dec. 25, 2013. Diomedes Diaz, one of the greatest performers of Colombia's accordion vallenato music, died Sunday, Dec. 22, 2013, at age 56. (AP Photo/Ricardo Mazalan)

  • Singers, Rafael Santos Diaz, left, Martin Elias Diaz, sons of singer and composer Diomedes Diaz, embrace in from of his coffin during a funeral mass at the main square of Valledupar, Colombia's northern state of Cesar, Wednesday, Dec. 25, 2013. Diomedes Diaz, one of the greatest performers of Colombia's accordion vallenato music, died Sunday, Dec. 22, 2013, at age 56. (AP Photo/Ricardo Mazalan)

  • Luz Consuelo Martinez

    Luz Consuelo Martinez, wife of singer and composer Diomedes Diaz, top left, mourns over his coffin at the main square in Valledupar, in Colombia's northern state of Cesar, Monday, Dec. 23, 2013. Diaz, one of the greatest performers of Colombia's vallenato music, died Sunday. He was 56. (AP Photo/Adamis Guerra)

  • Martin Elias Diaz

    Singer Martin Elias Diaz, the son of singer and composer Diomedes Diaz, embraces a man as the coffin of his father arrives to the main square where his body will lie in state until his funeral in Valledupar, Colombia, Monday, Dec. 23, 2013. Diaz, one of the greatest performers of Colombia's vallenato music, died on Sunday. He as 56. (AP Photo/Adamis Guerra)

  • Men carry the coffin of singer and composer Diomedes Diaz to the main square where his body will lie in state until his funeral in Valledupar, Colombia, Monday, Dec. 23, 2013. Diaz, one of the greatest performers of Colombia's vallenato music, died on Sunday. He was 56. (AP Photo/Adamis Guerra)

  • Fans of Colombian singer and composer Diomedes Diaz surround a firefighter truck carrying his coffin to the main square where his body will lie in state until his funeral in Valledupar, Colombia, Monday, Dec. 23, 2013. Diaz, one of the greatest performers of Colombia's vallenato music, died on Sunday. He as 56. (AP Photo/Adamis Guerra)