Konstantin Petrov (KEi) is one of the pioneers of Bulgarian techno and house music.

He began creating music in the turbulent era of post-communist Bulgaria, when he only had primitive tracker software at his disposal. He is also known for the artistic collective pBPM (porno bpm), created in Sofia in 2001, popular for its label and series of events that laid the foundations for KEi's remarkable 25-year career, cementing his distinctive status in the capital's underground scene. His experience and extensive knowledge in music production led to a partnership in 2019 with his long-time friend KiNK in the vinyl label Sofia Records.

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