Despite their commercial popularity, the group were dissatisfied creatively; lead vocalist Bono believed they were musically unprepared for their success, while drummer Larry Mullen, Jr. said, "We were the biggest, but we weren't the best." By the band's 1989 Lovetown Tour, they had become bored with playing their greatest hits. U2 believe that audiences misunderstood the group's collaboration with blues musician B.B. King on "Rattle and Hum" and the Lovetown Tour, and they described it as "an excursion down a dead-end street". Bono said that, in retrospect, listening to black music enabled the group to create a work such as "Achtung Baby", while their experiences with folk music helped him to develop as a lyricist. Towards the end of the Lovetown Tour, Bono announced on-stage that it was "the end of something for U2", and that "we have to go away and ... dream it all up again". Following the tour, the group began, what was at the time, their longest break from public performances and album releases.