MEC can refer to:

Anna Maria Jopek (born 14 December 1970 in Warsaw) is a Polish musician and singer. She represented her country in the 1997 Eurovision Song Contest, with the song "Ale jestem" and finished 11th out of 25 participating acts; and in 2002, she collaborated on an album with jazz guitarist Pat Metheny. She is the recipient of numerous awards for her music, including Michel Legrand's Personal Award in Vitebsk in 1994, as well as all of the awards for music in Poland, together with gold and platinum records. However, she has said: "Music itself is the highest award for me. And the greatest challenge. With so many questions remaining to be answered". She's married to music journalist, photographer and guitarist Marcin Kydryński, and has two sons, Franciszek (b. 1998) and Stanisław (b. 2000).

Anna Maria Jopek is the daughter of Mazowsze singer Stanisław Jopek (1935–2006), who is known as the "First Coachman of Poland" for his signature song "Furman" (The Coachman), and former Mazowsze dancer Maria Stankiewicz. Her 1999 Christmas album Dzisiaj z Betleyem features two duets with her father. Anna Maria's sister, Patrycja is a violinist.

Irena Jarocka (18 August 1946 – 21 January 2012), was a Polish singer.

Jarocka was born in Srebrna Góra, Poland. She graduated from the V Liceum Ogólnokształcące im. Stefana Żeromskiego, and the faculty of music studies at Średnia Szkoła Muzyczna in Gdańsk, studying under professor Halina Mickiewiczówna. She later graduated from a Faculty of Biology at a teachers’ college.^{[clarification needed]} Between 1969 and 1973 she lived in Paris on a scholarship, studying at Le Petit Conservatoire de la Chanson.^{[citation needed]}. She died after losing her battle with brain cancer on the 21st of January 2012 in Warsaw.

Jarocka participated in amateur singing competitions, and worked with Zespół Estradowy Marynarki Wojennej Flotylla. In 1966, at 20 years old, she debuted at Klub Rudy Kot in Gdańsk, and first participated in the Krajowy Festiwal Piosenki Polskiej in Opole. She also performed at the Sopot Festival.^{[citation needed]}

She recorded albums for the Philips label and performed in concerts with Michel Sardou, Enrico Macias, Charles Aznavour, and Mireille Mathieu. She has sung in concerts within Poland and in Germany, Czechoslovakia, Bulgaria, Switzerland, Italy, Portugal, Luxembourg, Australia and France, and for Polish communities in the USA and Canada. Jarocka has worked with Polanie, Czerwone Gitary, Budka Suflera, and Exodus.^{[citation needed]}