Birth Control is often categorized as a krautrock band, but these Germans go a step further, fusing hard rock with progressive rock, bearing many similarities to the progressive rock being made in Great Britain at the time. "Operation" was Birth Control's second release, an album that follows a stylistic path very similar to their debut. With cover art that is, in a way, a deliberate reaction to a statement by Pope Paul VI, who categorically declared any form of contraception immoral, the group remained true to their musical roots, showcasing, as with their debut, a devastating hard rock sound infused with funk, blues, and progressive elements. Heavy hard rock tracks like "Pandemonium" and "Stop Little Lady" blend with bluesier songs like "The Work Is Done" and progressive gems like the brilliant "Just Before The Sun Will Rise" and "Let Us Do It Now".

