Oleg Ryabets was born on June 28, 1967 in Kyiv (Ukraine). He started to sing at the very young age, fist at the Little Bell Choir, then at the boys choir under the Kyiv State Male Capella named after Revutsky. Later he toured in the cities of the Soviet Union and in Europe already as a soloist of the Capella. Oleg studied solo singing at Kyiv State Conservatoire with professor Claudia Radchenko (Kyiv, Ukraine) and at State Classical Academy named after Maimonid (1988 1995) with professor Vazha Chachava (Moscow, Russia). He also took master-classes with professor of Russian Gnessin Academy of Music, Zara Dolukhanova (Moscow, Russia).|
Ryabets made his debut as a soprano soloist in 1990 he sang the soprano part in Symphony No.2 by A.Schnittke with The Grand Symphony Orchestra under Gennady Rozhdestvensky at the Grand Hall of Moscow State Conservatoire. Since then Oleg sings in concerts, gives solo recitals and performs main parts in baroque, classical and contemporary operas, such as Gandarte in Alessandro nell'Indie by J.Ch.Bach, Enea in Enea nel Lazio by G.Sarti, Amore in Orfeo ed Euridice by C.W.Gluck, Irina in Three Sisters by Péter Eötvös, Count Myshkin in N.F.B. by Vladimir Kobekin, Lenin in "Naked Revolution" by Dave Soldier, Gustav IV in Tsarina by David Tukhmanov and others.
Oleg sang in Germany, Switzerland, Austria, United Kingdom, France, Italy, Netherlands, Latvia, USA, Japan and Ukraine. On October 17, 1994 he sang special concert dedicated to the first and only official visit of Queen Elizabeth II to Russia. In 1996 he sang in London (England) at the celebration of the 75th anniversary of His Royal Highness Duke of Edinburgh Prince Philipp, who conferred Oleg with the title Mister Soprano after his performance. On January 10, 2005 Ryabets took part in a performance-pasticcio Farinelli Kidnapping dedicated to 300 anniversary of the famous Italian castrato singer of the XVIII century, Carlo Broschi "Farinelli" (Farinelli-project by Vladimir Reshetov, Riga, Latvia). Since then Oleg several times sang at the International Music Festival Farinelli-fest in Riga (Latvia).
Ryabets' voice has a quality and range ( a c''' ) which are quite rare among countertenors. Recording of his voice is preserved at the British National Sound Archive in London (England) together with the one and only recording of the last known castrato singer Alessandro Moreschi.