Boris Borisovich Grebenshchikov is a prominent member of the generation which is widely considered to be the "founding fathers" of Russian rock music. He is the founder and lead singer of the band Aquarium which has been active since 1972. Grebenshchikov is frequently referred to as BG, after his initials.
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https://en.wikipedia.org/wiki/Boris_Grebenshchikov
Aquarium or Akvarium is a Russian rock group formed in Leningrad in 1972. The band is considered one of the founders of Russian rock. Aquarium has had many line-up changes over its history, and lead singer and founder Boris Grebenshchikov is the only remaining original member. Former band members include Anatoly Gunitsky, Mikhail Feinstein, Andrei "Dyusha" Romanov, Vsevolod Gakkel, and Sergey Kuryokhin.
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https://en.wikipedia.org/wiki/Aquarium_(band)