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.

A metal umlaut is a diacritic that is sometimes used gratuitously or decoratively over letters in the names of mainly hard rock or heavy metal bands—for example, those of Blue Öyster Cult, Queensrÿche, Motörhead, the Accüsed, Mötley Crüe and the parody bands Spın̈al Tap and Green Jellÿ.