Mihail Popyordanov "Milko" Kalaidjiev (Bulgarian: Михаил Попйорданов Калайджиев - Милко) is the first Bulgarian singer signed to the Payner label. He was born on 23 September 1951 in Svilengrad, Bulgaria.

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Milko has three children. His eldest son works as a lawyer in Sofia. His twins, Aleks and Antonio (born 1987), are from his wife Margarita. He works as a farmer and a businessman.

In 2019, he ran as a mayor for the Svilengrad Municipality from Movement for Rights and Freedoms (DPS) in the 2019 Bulgarian local elections and gained 4% of the vote.

• 1996 - Има ли Господ? (Is there a God?)

• 1997 - Прошка (Forgiveness)
• 1998 - Спомен за обич (Memory of love)
• 1999 - Най-доброто (The Best)
• 2000 - GSM
• 2001 - Софиянка (Woman from Sofia)
• 2002 - Тарикат и тарикатка (Wiseguy and wisewoman)
• 2002 - Европеец - произведено в България (European - Made in Bulgaria)
• 2003 - Танцувай с мен (Dance with me)
• 2004 - Десетият (The Tenth)
• 2013 - Кръчма е душата ми (My soul is a pub)

Milko has performed in North Macedonia, Israel, United States, Albania, Turkey, Netherlands, Greece, Cyprus and Canada.

As a singer, Milko discovered the famous Bulgarian pop-folk singers Preslava, Galena, Мira, Anelia, Emilia, Dzhena and others.

• Duet of the year (Hey, the little) with Mira - 2003 (Planeta TV Bulgaria)
• Song of the year 2009 (Planeta TV Bulgaria)